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From Wikipedia, the free encyclopedia

87 (eighty-seven) is the natural number following 86 and preceding 88.

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Transcription

Contents

In mathematics

87 is:

  • the sum of the squares of the first four primes (87 = 22 + 32 + 52 + 72).
  • the sum of the sums of the divisors of the first 10 positive integers.[1]
  • the twenty-sixth distinct semiprime and the eighth of the form (3.q).
  • 5! - 4! - 3! - 2! - 1! = 87

In sports

In other fields

Eighty-seven is also:

See also


References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
This page was last edited on 26 March 2019, at 18:31
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