687915568 has 40 divisors (see below), whose sum is σ = 1362363200. Its totient is φ = 336420864.

The previous prime is 687915541. The next prime is 687915601. The reversal of 687915568 is 865519786.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135280 + ... + 140272.

It is an arithmetic number, because the mean of its divisors is an integer number (34059080).

Almost surely, 2^687915568 is an apocalyptic number.

It is an amenable number.

687915568 is a deficient number, since it is larger than the sum of its proper divisors (674447632).

687915568 is a wasteful number, since it uses less digits than its factorization.

687915568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189 (or 5183 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 55.

The square root of 687915568 is about 26228.1445779148. The cubic root of 687915568 is about 882.7648782914.

The spelling of 687915568 in words is "six hundred eighty-seven million, nine hundred fifteen thousand, five hundred sixty-eight".