56515560 has 64 divisors (see below), whose sum is σ = 171262080. Its totient is φ = 14918400.

The previous prime is 56515553. The next prime is 56515579. The reversal of 56515560 is 6551565.

It is a super-2 number, since 2×56515560² = 6388017044227200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9789 + ... + 14451.

It is an arithmetic number, because the mean of its divisors is an integer number (2675970).

Almost surely, 2^56515560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56515560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85631040).

56515560 is an abundant number, since it is smaller than the sum of its proper divisors (114746520).

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

56515560 is a wasteful number, since it uses less digits than its factorization.

56515560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4774 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 56515560 is about 7517.6831537383. The cubic root of 56515560 is about 383.7567361159.

It can be divided in two parts, 56515 and 560, that added together give a palindrome (57075).

The spelling of 56515560 in words is "fifty-six million, five hundred fifteen thousand, five hundred sixty".