87139515 has 16 divisors (see below), whose sum is σ = 139783968. Its totient is φ = 46354176.

The previous prime is 87139499. The next prime is 87139523. The reversal of 87139515 is 51593178.

It is not a de Polignac number, because 87139515 - 2⁴ = 87139499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362 + ... + 13271.

It is an arithmetic number, because the mean of its divisors is an integer number (8736498).

Almost surely, 2^87139515 is an apocalyptic number.

87139515 is a deficient number, since it is larger than the sum of its proper divisors (52644453).

87139515 is a wasteful number, since it uses less digits than its factorization.

87139515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15038.

The product of its digits is 37800, while the sum is 39.

The square root of 87139515 is about 9334.8548462202. The cubic root of 87139515 is about 443.3414929937.

The spelling of 87139515 in words is "eighty-seven million, one hundred thirty-nine thousand, five hundred fifteen".