656704028 has 12 divisors (see below), whose sum is σ = 1149422400. Its totient is φ = 328297632.

The previous prime is 656703997. The next prime is 656704039. The reversal of 656704028 is 820407656.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 656703982 and 656704000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27125 + ... + 45267.

It is an arithmetic number, because the mean of its divisors is an integer number (95785200).

Almost surely, 2^656704028 is an apocalyptic number.

It is an amenable number.

656704028 is a deficient number, since it is larger than the sum of its proper divisors (492718372).

656704028 is a wasteful number, since it uses less digits than its factorization.

656704028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27196 (or 27194 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 656704028 is about 25626.2371018454. The cubic root of 656704028 is about 869.2070230758.

The spelling of 656704028 in words is "six hundred fifty-six million, seven hundred four thousand, twenty-eight".