564021660 has 24 divisors (see below), whose sum is σ = 1579260816. Its totient is φ = 150405760.

The previous prime is 564021659. The next prime is 564021697. The reversal of 564021660 is 66120465.

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, 4700121 + ... + 4700240.

It is an arithmetic number, because the mean of its divisors is an integer number (65802534).

Almost surely, 2^564021660 is an apocalyptic number.

It is an amenable number.

564021660 is an abundant number, since it is smaller than the sum of its proper divisors (1015239156).

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

564021660 is a wasteful number, since it uses less digits than its factorization.

564021660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400373 (or 9400371 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 564021660 is about 23749.1401949628. The cubic root of 564021660 is about 826.2254991541.

The spelling of 564021660 in words is "five hundred sixty-four million, twenty-one thousand, six hundred sixty".