688536388 has 12 divisors (see below), whose sum is σ = 1211671440. Its totient is φ = 342344552.

The previous prime is 688536347. The next prime is 688536389. The reversal of 688536388 is 883635886.

It is not an unprimeable number, because it can be changed into a prime (688536389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480106 + ... + 481537.

It is an arithmetic number, because the mean of its divisors is an integer number (100972620).

Almost surely, 2^688536388 is an apocalyptic number.

It is an amenable number.

688536388 is a deficient number, since it is larger than the sum of its proper divisors (523135052).

688536388 is a wasteful number, since it uses less digits than its factorization.

688536388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961826 (or 961824 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 55.

The square root of 688536388 is about 26239.9769054776. The cubic root of 688536388 is about 883.0303533671.

The spelling of 688536388 in words is "six hundred eighty-eight million, five hundred thirty-six thousand, three hundred eighty-eight".