56558220 has 24 divisors (see below), whose sum is σ = 158363184. Its totient is φ = 15082176.

The previous prime is 56558209. The next prime is 56558239. The reversal of 56558220 is 2285565.

56558220 = 203² + 204² + ... + 562².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471259 + ... + 471378.

It is an arithmetic number, because the mean of its divisors is an integer number (6598466).

Almost surely, 2^56558220 is an apocalyptic number.

It is an amenable number.

56558220 is an abundant number, since it is smaller than the sum of its proper divisors (101804964).

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

56558220 is a wasteful number, since it uses less digits than its factorization.

56558220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942649 (or 942647 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 56558220 is about 7520.5199288347. The cubic root of 56558220 is about 383.8532696778.

It can be divided in two parts, 565 and 58220, that added together give a palindrome (58785).

The spelling of 56558220 in words is "fifty-six million, five hundred fifty-eight thousand, two hundred twenty".