56617728 has 36 divisors (see below), whose sum is σ = 150687768. Its totient is φ = 18872320.

The previous prime is 56617723. The next prime is 56617753. The reversal of 56617728 is 82771665.

It is a self number, because there is not a number n which added to its sum of digits gives 56617728.

It is not an unprimeable number, because it can be changed into a prime (56617723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36093 + ... + 37628.

Almost surely, 2^56617728 is an apocalyptic number.

It is an amenable number.

56617728 is an abundant number, since it is smaller than the sum of its proper divisors (94070040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56617728 is an equidigital number, since it uses as much as digits as its factorization.

56617728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740 (or 73726 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 56617728 is about 7524.4752640965. The cubic root of 56617728 is about 383.9878468376.

The spelling of 56617728 in words is "fifty-six million, six hundred seventeen thousand, seven hundred twenty-eight".