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70 (number)

From Wikipedia, the free encyclopedia
Natural number
← 6970 71 →
Cardinalseventy
Ordinal70th
(seventieth)
Factorization2 x 5 x 7
Divisors1, 2, 5, 7, 10, 14, 35, 70
Greek numeralΟ´
Roman numeralLXX,lxx
Binary10001102
Ternary21213
Senary1546
Octal1068
Duodecimal5A12
Hexadecimal4616
Hebrewע
Lao
ArmenianՀ
Babylonian numeral𒐕𒌋
Egyptian hieroglyph𓎌

70 (seventy) is the natural number following69 and preceding71.

Mathematics

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70 is acomposite number anErdős–Woods number[1], aPell number, acentral binomial coefficient[2], and aprimitive abundant number. 70 is the smallestweird number, which is a natural number that isabundant but notsemiperfect.[3]

70 is also part of the only nontrivial solution pair to thecannonball problem, along with24.

In religion

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In other fields

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Number name

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Main article:Numeral (linguistics)
Look upseventy in Wiktionary, the free dictionary.

Several languages, especially ones withvigesimal number systems, do not have a specific word for 70: for example,French:soixante-dix,lit.'sixty-ten';Danish:halvfjerds, short forhalvfjerdsindstyve,'three and a half score'. (For French, this is true only in France, Canada and Luxembourg; other French-speaking regions such asBelgium,Switzerland,Aosta Valley andJersey useseptante.)[4]

Notes

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References

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  1. ^"Sloane's A059756 : Erdős-Woods numbers".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-29.
  2. ^Sloane, N. J. A. (ed.)."Sequence A000984 (Central binomial coefficients: binomial(2*n,n) as (2*n)!/(n!)^2.)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^"Sloane's A006037 : Weird numbers".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-29.
  4. ^Peter Higgins,Number Story. London: Copernicus Books (2008): 19. "Belgian French speakers however grew tired of this and introduced the new names septante, octante, nonante etc. for these numbers".

External links

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