56821515728 has 40 divisors (see below), whose sum is σ = 111008692608. Its totient is φ = 28174874112.

The previous prime is 56821515701. The next prime is 56821515731. The reversal of 56821515728 is 82751512865.

56821515728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1183976 + ... + 1231032.

Almost surely, 2^56821515728 is an apocalyptic number.

It is an amenable number.

56821515728 is a deficient number, since it is larger than the sum of its proper divisors (54187176880).

56821515728 is a wasteful number, since it uses less digits than its factorization.

56821515728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47691 (or 47685 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 50.

The spelling of 56821515728 in words is "fifty-six billion, eight hundred twenty-one million, five hundred fifteen thousand, seven hundred twenty-eight".