64512920 has 16 divisors (see below), whose sum is σ = 145154160. Its totient is φ = 25805152.

The previous prime is 64512919. The next prime is 64512937. The reversal of 64512920 is 2921546.

It is a happy number.

64512920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 806372 + ... + 806451.

It is an arithmetic number, because the mean of its divisors is an integer number (9072135).

Almost surely, 2^64512920 is an apocalyptic number.

It is an amenable number.

64512920 is an abundant number, since it is smaller than the sum of its proper divisors (80641240).

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

64512920 is a wasteful number, since it uses less digits than its factorization.

64512920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612834 (or 1612830 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 64512920 is about 8031.9935258938. The cubic root of 64512920 is about 401.0657413002.

The spelling of 64512920 in words is "sixty-four million, five hundred twelve thousand, nine hundred twenty".