688668530 has 32 divisors (see below), whose sum is σ = 1411095168. Its totient is φ = 239536000.

The previous prime is 688668511. The next prime is 688668557. The reversal of 688668530 is 35866886.

688668530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133571 + ... + 138630.

It is an arithmetic number, because the mean of its divisors is an integer number (44096724).

Almost surely, 2^688668530 is an apocalyptic number.

688668530 is an abundant number, since it is smaller than the sum of its proper divisors (722426638).

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

688668530 is a wasteful number, since it uses less digits than its factorization.

688668530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272242.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 688668530 is about 26242.4947365909. The cubic root of 688668530 is about 883.0868393351.

The spelling of 688668530 in words is "six hundred eighty-eight million, six hundred sixty-eight thousand, five hundred thirty".