56721604 has 12 divisors (see below), whose sum is σ = 99334144. Its totient is φ = 28340424.

The previous prime is 56721589. The next prime is 56721647. The reversal of 56721604 is 40612765.

It is a happy 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, 2389 + ... + 10915.

Almost surely, 2^56721604 is an apocalyptic number.

It is an amenable number.

56721604 is a deficient number, since it is larger than the sum of its proper divisors (42612540).

56721604 is a wasteful number, since it uses less digits than its factorization.

56721604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194 (or 10192 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 56721604 is about 7531.3746421221. The cubic root of 56721604 is about 384.2225363027. Note that the first 3 decimals are identical.

The spelling of 56721604 in words is "fifty-six million, seven hundred twenty-one thousand, six hundred four".