← 69 71 → 70
← 70 71 72 73 74 75 76 77 78 79 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	seventy
Ordinal	70th (seventieth)
Factorization
Divisors	1,2 5, 7, 10, 14, 35, 70
Roman numeral	LXX
Binary	10001102
Octal	1068
Duodecimal	5A12
Hexadecimal	4616
Hebrew	ע (Ayin)

Look up seventy in
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70 (seventy) is the natural number following 69 and preceding 71.

In mathematics

Its factorization makes it a sphenic number. 70 is a Pell number and a generalized heptagonal number, one of only two numbers to be both.^[1] Also, it is the seventh pentagonal number and the fourth 13-gonal number, as well as the fifth pentatope number. It is the smallest weird number.

Since it is possible to find sequences of 70 consecutive integers such that each inner member member shares a factor with either the first or the last member, 70 is an Erdős–Woods number.

In base 10, it is a Harshad number.

In science

• 70 is the atomic number of ytterbium, a lanthanide

Astronomy

• Messier object M70, a magnitude 9.0 globular cluster in the constellation Sagittarius
• The New General Catalogue object NGC 70, a magnitude 13.4 spiral galaxy in the constellation Andromeda
• The Saros number of the solar eclipse series which began on -821 September 5 and ended on 676 February 19. The duration of Saros series 70 was 1496.5 years, and it contained 84 solar eclipses. Further, the Saros number of the lunar eclipse series which began on -519 June 13 and ended on 761 July 21. The duration of Saros series 70 was 1280.1 years, and it contained 72 lunar eclipses.

In religion

• Seventy souls went down to Egypt to begin the Hebrew's Egyptian exile (Genesis 46:27)
• According to Jewish tradition, there is a core of 70 nations and 70 world languages
• Seventy elders were assembled by Moses on God's command in the desert (Numbers 11:16-30)
• Ptolemy II Philadelphus ordered 72 Jewish elders to translate the Torah into Greek; the result was the Septuagint (from the Latin for "seventy")
• In the Gospel of Matthew, 18:21-22, Jesus tells Peter to forgive people seventy times seven times.
• The Roman numeral seventy, LXX, is the scholarly symbol for the Septuagint.
• In the Gospel of Luke 10:1-24, Jesus appoints Seventy Disciples and sends them out in pairs to preach the Gospel.
• Seventy, a priesthood office of The Church of Jesus Christ of Latter-day Saints and other Latter Day Saint sects.
• The old testament allots three score and ten (70 years) for a man's life

In law

• 70 years: public domain#Expiration

In sports

• New York Giants Sam Huff wore #70
• San Francisco 49ers Charlie Krueger wore #70
• Chicago Bears Herman Lee wore #70
• New England Patriots Logan Mankins wears #70
• Minnesota Vikings Jim Marshall wore #70
• Pittsburgh Steelers Ernie Stautner wore #70
• NASCAR J. D. McDuffie was known for driving car #70
• Baltimore Colts Art Donovan wore #70

In other fields

70 is:

• the designation of USA Interstate 70, a freeway that goes from Utah to Maryland
• Municipal Okrug 70, a municipal okrug of Primorsky District of Saint Petersburg, Russia
• In miles per hour, a common speed limit for freeways in many American states, primarily in the central United States (in the Eastern U.S. the speed limit is generally 65, in the Western U.S. it is 75).
• In miles per hour, the national speed limit in the United Kingdom.
• In years of marriage, the platinum wedding anniversary
• The registry of the U.S. Navy's nuclear aircraft carrier USS Carl Vinson (CVN-70), named after U.S. Representative Carl Vinson.
• The number of the French department Haute-Saône
• Historical years: AD 70, 70 BC, or 1970.
• The number 70 is the subject of the Boards of Canada song, "The Smallest Weird Number" on the 2002 album, Geogaddi.
• Elton John's live album "11-17-70"
• Benjamin Franklin was 70 in 1776
• Cornelius Vanderbilt was 70 when he bought the Hudson River Railroad in 1864
• Justice John Sirica was 70 when he heard the Watergate case in 1974

Number name

Main article: number name

The French do not have a word for 70, instead using "soixante-dix" (60 + 10). Other French-speaking countries such as Belgium and Switzerland do have a word for it, using "septante."^[2]

Notes