70 (Number)

70 (seventy) is the natural number following 69 and preceding 71.
Cardinal seventy
Ordinal70th (seventieth)
Numeral system
Factorization2 \cdot 5 \cdot 7
Divisors 2, 5, 7, 10, 14, 35
Roman numeralLXX
Binary1000110
Hexadecimal46
Hebrewע (Ayin)

In mathematics

70 is a Pell number and a Harshad number. Its factorization makes it a sphenic number. It is the seventh pentagonal number and the fourth 13-gonal number. It is the smallest weird number.

In science

In 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.
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 other fields

70 is:

 

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