70 (seventy) is the natural number following 69 and preceding 71.
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Cardinal | seventy | |||
Ordinal | 70th (seventieth) | |||
Factorization | 2 × 5 × 7 | |||
Divisors | 1, 2, 5, 7, 10, 14, 35, 70 | |||
Greek numeral | Ο´ | |||
Roman numeral | LXX | |||
Binary | 10001102 | |||
Ternary | 21213 | |||
Senary | 1546 | |||
Octal | 1068 | |||
Duodecimal | 5A12 | |||
Hexadecimal | 4616 | |||
Hebrew | ע | |||
Lao | ໗ | |||
Armenian | Հ | |||
Babylonian numeral | 𒐕𒌋 | |||
Egyptian hieroglyph | 𓎌 |
70 is:
The sum of the first 24 squares starting from 1 is 702 = 4900, i.e. a square pyramidal number. This is the only non trivial solution to the cannonball problem and relates 70 to the Leech lattice and thus string theory.
Several languages, especially ones with vigesimal number systems, do not have a specific word for 70: for example, French: soixante-dix, lit. 'sixty-ten'; Danish: halvfjerds, short for halvfjerdsindstyve, 'three and a half score'. (For French, this is true only in France; other French-speaking regions such as Belgium, Switzerland, Aosta Valley and Jersey use septante.[8])