688551964 has 12 divisors (see below), whose sum is σ = 1205182944. Its totient is φ = 344213984.

The previous prime is 688551953. The next prime is 688552043. The reversal of 688551964 is 469155886.

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, 17112 + ... + 40864.

It is an arithmetic number, because the mean of its divisors is an integer number (100431912).

Almost surely, 2^688551964 is an apocalyptic number.

It is an amenable number.

688551964 is a deficient number, since it is larger than the sum of its proper divisors (516630980).

688551964 is a wasteful number, since it uses less digits than its factorization.

688551964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31004 (or 31002 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The square root of 688551964 is about 26240.2737028408. The cubic root of 688551964 is about 883.0370119245.

The spelling of 688551964 in words is "six hundred eighty-eight million, five hundred fifty-one thousand, nine hundred sixty-four".