64565856 has 48 divisors (see below), whose sum is σ = 188319600. Its totient is φ = 21521664.

The previous prime is 64565801. The next prime is 64565867. The reversal of 64565856 is 65856546.

It is a happy number.

64565856 is a `hidden beast` number, since 6 + 4 + 565 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×64565856² = 8337499522025472, which contains 22 as substring.

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, 36501 + ... + 38228.

It is an arithmetic number, because the mean of its divisors is an integer number (3923325).

Almost surely, 2^64565856 is an apocalyptic number.

It is an amenable number.

64565856 is an abundant number, since it is smaller than the sum of its proper divisors (123753744).

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

64565856 is a wasteful number, since it uses less digits than its factorization.

64565856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74748 (or 74734 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 64565856 is about 8035.2881715593. The cubic root of 64565856 is about 401.1754093158.

The spelling of 64565856 in words is "sixty-four million, five hundred sixty-five thousand, eight hundred fifty-six".