87639408 has 60 divisors (see below), whose sum is σ = 254363928. Its totient is φ = 29211840.

The previous prime is 87639397. The next prime is 87639413. The reversal of 87639408 is 80493678.

It is a happy number.

87639408 is a `hidden beast` number, since 8 + 7 + 639 + 4 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7383 + ... + 15158.

Almost surely, 2^87639408 is an apocalyptic number.

It is an amenable number.

87639408 is an abundant number, since it is smaller than the sum of its proper divisors (166724520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87639408 is a wasteful number, since it uses less digits than its factorization.

87639408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22564 (or 22546 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 87639408 is about 9361.5921722750. The cubic root of 87639408 is about 444.1876489510.

The spelling of 87639408 in words is "eighty-seven million, six hundred thirty-nine thousand, four hundred eight".