656924940 has 72 divisors (see below), whose sum is σ = 2277344160. Its totient is φ = 150153984.

The previous prime is 656924929. The next prime is 656924953. The reversal of 656924940 is 49429656.

656924940 is a `hidden beast` number, since 6 + 569 + 2 + 49 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259425 + ... + 261944.

It is an arithmetic number, because the mean of its divisors is an integer number (31629780).

Almost surely, 2^656924940 is an apocalyptic number.

656924940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656924940 is an abundant number, since it is smaller than the sum of its proper divisors (1620419220).

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

656924940 is a wasteful number, since it uses less digits than its factorization.

656924940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521391 (or 521386 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 656924940 is about 25630.5470093793. The cubic root of 656924940 is about 869.3044778024.

The spelling of 656924940 in words is "six hundred fifty-six million, nine hundred twenty-four thousand, nine hundred forty".