688868920 has 16 divisors (see below), whose sum is σ = 1549955160. Its totient is φ = 275547552.

The previous prime is 688868903. The next prime is 688868963. The reversal of 688868920 is 29868886.

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, 8610822 + ... + 8610901.

Almost surely, 2^688868920 is an apocalyptic number.

It is an amenable number.

688868920 is an abundant number, since it is smaller than the sum of its proper divisors (861086240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688868920 is a wasteful number, since it uses less digits than its factorization.

688868920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17221734 (or 17221730 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 55.

The square root of 688868920 is about 26246.3125029022. The cubic root of 688868920 is about 883.1724850909.

The spelling of 688868920 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, nine hundred twenty".