87 (number)

← 86 87 88 →
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Cardinal eighty-seven
Ordinal 87th
(eighty-seventh)
Factorization 3 × 29
Divisors 1, 3, 29, 87
Greek numeral ΠΖ´
Roman numeral LXXXVII
Binary 10101112
Ternary 100203
Quaternary 11134
Quinary 3225
Senary 2236
Octal 1278
Duodecimal 7312
Hexadecimal 5716
Vigesimal 4720
Base 36 2F36

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

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.
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