64564816 has 20 divisors (see below), whose sum is σ = 129130624. Its totient is φ = 31240800.

The previous prime is 64564807. The next prime is 64564823. The reversal of 64564816 is 61846546.

It is a happy number.

64564816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

64564816 is an admirable number.

It is a super-2 number, since 2×64564816² = 8337230930227712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64590 + ... + 65581.

Almost surely, 2^64564816 is an apocalyptic number.

It is an amenable number.

64564816 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

64564816 is a wasteful number, since it uses less digits than its factorization.

64564816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130210 (or 130204 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 64564816 is about 8035.2234567559. The cubic root of 64564816 is about 401.1732553153.

The spelling of 64564816 in words is "sixty-four million, five hundred sixty-four thousand, eight hundred sixteen".