56615320 has 32 divisors (see below), whose sum is σ = 129478320. Its totient is φ = 22273920.

The previous prime is 56615297. The next prime is 56615323. The reversal of 56615320 is 2351665.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56615323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9162 + ... + 14041.

Almost surely, 2^56615320 is an apocalyptic number.

It is an amenable number.

56615320 is an abundant number, since it is smaller than the sum of its proper divisors (72863000).

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

56615320 is a wasteful number, since it uses less digits than its factorization.

56615320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23275 (or 23271 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 56615320 is about 7524.3152512372. The cubic root of 56615320 is about 383.9824029841.

Adding to 56615320 its reverse (2351665), we get a palindrome (58966985).

The spelling of 56615320 in words is "fifty-six million, six hundred fifteen thousand, three hundred twenty".