564551220 has 24 divisors (see below), whose sum is σ = 1580743584. Its totient is φ = 150546976.

The previous prime is 564551213. The next prime is 564551231. The reversal of 564551220 is 22155465.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 4704534 + ... + 4704653.

It is an arithmetic number, because the mean of its divisors is an integer number (65864316).

Almost surely, 2^564551220 is an apocalyptic number.

It is an amenable number.

564551220 is an abundant number, since it is smaller than the sum of its proper divisors (1016192364).

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

564551220 is a wasteful number, since it uses less digits than its factorization.

564551220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9409199 (or 9409197 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 564551220 is about 23760.2866144329. The cubic root of 564551220 is about 826.4839993404.

It can be divided in two parts, 56455 and 1220, that added together give a palindrome (57675).

The spelling of 564551220 in words is "five hundred sixty-four million, five hundred fifty-one thousand, two hundred twenty".