656728052 has 12 divisors (see below), whose sum is σ = 1159818660. Its totient is φ = 325351296.

The previous prime is 656728043. The next prime is 656728067. The reversal of 656728052 is 250827656.

It can be written as a sum of positive squares in 2 ways, for example, as 239506576 + 417221476 = 15476^2 + 20426^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752693 + ... + 753564.

It is an arithmetic number, because the mean of its divisors is an integer number (96651555).

Almost surely, 2^656728052 is an apocalyptic number.

It is an amenable number.

656728052 is a deficient number, since it is larger than the sum of its proper divisors (503090608).

656728052 is a wasteful number, since it uses less digits than its factorization.

656728052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506370 (or 1506368 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 656728052 is about 25626.7058359049. The cubic root of 656728052 is about 869.2176222570.

The spelling of 656728052 in words is "six hundred fifty-six million, seven hundred twenty-eight thousand, fifty-two".