688635604 has 12 divisors (see below), whose sum is σ = 1205513428. Its totient is φ = 344203200.

The previous prime is 688635593. The next prime is 688635613. The reversal of 688635604 is 406536886.

It can be written as a sum of positive squares in 2 ways, for example, as 13675204 + 674960400 = 3698^2 + 25980^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14337 + ... + 39784.

Almost surely, 2^688635604 is an apocalyptic number.

It is an amenable number.

688635604 is a deficient number, since it is larger than the sum of its proper divisors (516877824).

688635604 is a wasteful number, since it uses less digits than its factorization.

688635604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57306 (or 57304 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 688635604 is about 26241.8673878213. The cubic root of 688635604 is about 883.0727653264.

The spelling of 688635604 in words is "six hundred eighty-eight million, six hundred thirty-five thousand, six hundred four".