56521220 has 48 divisors (see below), whose sum is σ = 136093440. Its totient is φ = 19315584.

The previous prime is 56521217. The next prime is 56521249. The reversal of 56521220 is 2212565.

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, 67766 + ... + 68594.

It is an arithmetic number, because the mean of its divisors is an integer number (2835280).

Almost surely, 2^56521220 is an apocalyptic number.

It is an amenable number.

56521220 is an abundant number, since it is smaller than the sum of its proper divisors (79572220).

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

56521220 is a wasteful number, since it uses less digits than its factorization.

56521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 56521220 is about 7518.0595900804. The cubic root of 56521220 is about 383.7695466919.

Adding to 56521220 its reverse (2212565), we get a palindrome (58733785).

The spelling of 56521220 in words is "fifty-six million, five hundred twenty-one thousand, two hundred twenty".