656728368 has 40 divisors (see below), whose sum is σ = 1732651008. Its totient is φ = 214251072.

The previous prime is 656728357. The next prime is 656728381. The reversal of 656728368 is 863827656.

It is a self number, because there is not a number n which added to its sum of digits gives 656728368.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143296 + ... + 147807.

Almost surely, 2^656728368 is an apocalyptic number.

It is an amenable number.

656728368 is an abundant number, since it is smaller than the sum of its proper divisors (1075922640).

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

656728368 is a wasteful number, since it uses less digits than its factorization.

656728368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291161 (or 291155 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The square root of 656728368 is about 25626.7120013473. The cubic root of 656728368 is about 869.2177616717.

The spelling of 656728368 in words is "six hundred fifty-six million, seven hundred twenty-eight thousand, three hundred sixty-eight".