688694924 has 12 divisors (see below), whose sum is σ = 1206534000. Its totient is φ = 343970928.

The previous prime is 688694899. The next prime is 688694969. The reversal of 688694924 is 429496886.

It is a self number, because there is not a number n which added to its sum of digits gives 688694924.

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, 89999 + ... + 97350.

It is an arithmetic number, because the mean of its divisors is an integer number (100544500).

Almost surely, 2^688694924 is an apocalyptic number.

It is an amenable number.

688694924 is a deficient number, since it is larger than the sum of its proper divisors (517839076).

688694924 is a wasteful number, since it uses less digits than its factorization.

688694924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188272 (or 188270 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The square root of 688694924 is about 26242.9976184124. The cubic root of 688694924 is about 883.0981209582.

The spelling of 688694924 in words is "six hundred eighty-eight million, six hundred ninety-four thousand, nine hundred twenty-four".