87 (number)

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86 87 88
Cardinal eighty-seven
Ordinal 87th
(eighty-seventh)
Factorization 3 × 29
Divisors 1, 3, 29, 87
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[edit]

87 is the twenty-sixth distinct semiprime and the eighth of the form (3.q). The aliquot sum of 87 is 33 within the aliquot sequence (87,33,15,9,4,3,1,0) 86 being the eighteenth composite number in the 3-aliquot tree.

87 is the sum of the squares of the first four primes. It is also the sum of the sum of divisors of the first ten integers.

In sports[edit]

In other fields[edit]

Eighty-seven is also: