64521688 has 32 divisors (see below), whose sum is σ = 150831360. Its totient is φ = 25138080.

The previous prime is 64521679. The next prime is 64521697. The reversal of 64521688 is 88612546.

64521688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64521679) and next prime (64521697).

It is a self number, because there is not a number n which added to its sum of digits gives 64521688.

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 7 ways as a sum of consecutive naturals, for example, 51756 + ... + 52987.

It is an arithmetic number, because the mean of its divisors is an integer number (4713480).

Almost surely, 2^64521688 is an apocalyptic number.

It is an amenable number.

64521688 is an abundant number, since it is smaller than the sum of its proper divisors (86309672).

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

64521688 is a wasteful number, since it uses less digits than its factorization.

64521688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104767 (or 104763 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 64521688 is about 8032.5393245225. The cubic root of 64521688 is about 401.0839101937.

The spelling of 64521688 in words is "sixty-four million, five hundred twenty-one thousand, six hundred eighty-eight".