87639537 has 16 divisors (see below), whose sum is σ = 123459840. Its totient is φ = 55208832.

The previous prime is 87639529. The next prime is 87639553. The reversal of 87639537 is 73593678.

It is not a de Polignac number, because 87639537 - 2³ = 87639529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87639557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6628 + ... + 14805.

It is an arithmetic number, because the mean of its divisors is an integer number (7716240).

Almost surely, 2^87639537 is an apocalyptic number.

87639537 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

87639537 is a deficient number, since it is larger than the sum of its proper divisors (35820303).

87639537 is a wasteful number, since it uses less digits than its factorization.

87639537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21512.

The product of its digits is 952560, while the sum is 48.

The square root of 87639537 is about 9361.5990621261. The cubic root of 87639537 is about 444.1878668902.

The spelling of 87639537 in words is "eighty-seven million, six hundred thirty-nine thousand, five hundred thirty-seven".