56621220 has 48 divisors (see below), whose sum is σ = 167868288. Its totient is φ = 14210560.

The previous prime is 56621207. The next prime is 56621281. The reversal of 56621220 is 2212665.

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, 26736 + ... + 28775.

It is an arithmetic number, because the mean of its divisors is an integer number (3497256).

Almost surely, 2^56621220 is an apocalyptic number.

It is an amenable number.

56621220 is an abundant number, since it is smaller than the sum of its proper divisors (111247068).

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

56621220 is a wasteful number, since it uses less digits than its factorization.

56621220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55540 (or 55538 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 56621220 is about 7524.7073032776. The cubic root of 56621220 is about 383.9957410552.

Adding to 56621220 its reverse (2212665), we get a palindrome (58833885).

The spelling of 56621220 in words is "fifty-six million, six hundred twenty-one thousand, two hundred twenty".