688868924 has 6 divisors (see below), whose sum is σ = 1205520624. Its totient is φ = 344434460.

The previous prime is 688868903. The next prime is 688868963. The reversal of 688868924 is 429868886.

688868924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86108612 + ... + 86108619.

It is an arithmetic number, because the mean of its divisors is an integer number (200920104).

Almost surely, 2^688868924 is an apocalyptic number.

It is an amenable number.

688868924 is a deficient number, since it is larger than the sum of its proper divisors (516651700).

688868924 is a wasteful number, since it uses less digits than its factorization.

688868924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172217235 (or 172217233 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 59.

The square root of 688868924 is about 26246.3125791034. The cubic root of 688868924 is about 883.1724868003.

The spelling of 688868924 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, nine hundred twenty-four".