87 (number)

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

86 87 88
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Cardinaleighty-seven
Ordinal87th
(eighty-seventh)
Factorization3 × 29
Divisors1, 3, 29, 87
Greek numeralΠΖ´
Roman numeralLXXXVII
Binary10101112
Ternary100203
Octal1278
Duodecimal7312
Hexadecimal5716

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 thirtieth semiprime,[2] and the twenty-sixth distinct semiprime[3] 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

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