656797940 has 24 divisors (see below), whose sum is σ = 1379814912. Its totient is φ = 262616480.

The previous prime is 656797931. The next prime is 656797943. The reversal of 656797940 is 49797656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656797943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65885 + ... + 75195.

It is an arithmetic number, because the mean of its divisors is an integer number (57492288).

Almost surely, 2^656797940 is an apocalyptic number.

It is an amenable number.

656797940 is an abundant number, since it is smaller than the sum of its proper divisors (723016972).

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

656797940 is a wasteful number, since it uses less digits than its factorization.

656797940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12847 (or 12845 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 53.

The square root of 656797940 is about 25628.0693771497. The cubic root of 656797940 is about 869.2484547689.

The spelling of 656797940 in words is "six hundred fifty-six million, seven hundred ninety-seven thousand, nine hundred forty".