656621804 has 12 divisors (see below), whose sum is σ = 1216681704. Its totient is φ = 308998464.

The previous prime is 656621767. The next prime is 656621813. The reversal of 656621804 is 408126656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4828034 + ... + 4828169.

It is an arithmetic number, because the mean of its divisors is an integer number (101390142).

Almost surely, 2^656621804 is an apocalyptic number.

It is an amenable number.

656621804 is a deficient number, since it is larger than the sum of its proper divisors (560059900).

656621804 is a wasteful number, since it uses less digits than its factorization.

656621804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9656224 (or 9656222 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 656621804 is about 25624.6327583441. The cubic root of 656621804 is about 869.1707446012.

The spelling of 656621804 in words is "six hundred fifty-six million, six hundred twenty-one thousand, eight hundred four".