64564920 has 96 divisors (see below), whose sum is σ = 239821920. Its totient is φ = 14757120.

The previous prime is 64564897. The next prime is 64564931. The reversal of 64564920 is 2946546.

64564920 is a `hidden beast` number, since 6 + 4 + 5 + 649 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10291 + ... + 15330.

It is an arithmetic number, because the mean of its divisors is an integer number (2498145).

Almost surely, 2^64564920 is an apocalyptic number.

64564920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64564920 is an abundant number, since it is smaller than the sum of its proper divisors (175257000).

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

64564920 is a wasteful number, since it uses less digits than its factorization.

64564920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25645 (or 25638 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 64564920 is about 8035.2299282597. The cubic root of 64564920 is about 401.1734707164.

The spelling of 64564920 in words is "sixty-four million, five hundred sixty-four thousand, nine hundred twenty".