63645864 has 16 divisors (see below), whose sum is σ = 159114720. Its totient is φ = 21215280.

The previous prime is 63645859. The next prime is 63645917. The reversal of 63645864 is 46854636.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325932 + ... + 1325979.

It is an arithmetic number, because the mean of its divisors is an integer number (9944670).

Almost surely, 2^63645864 is an apocalyptic number.

It is an amenable number.

63645864 is an abundant number, since it is smaller than the sum of its proper divisors (95468856).

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

63645864 is a wasteful number, since it uses less digits than its factorization.

63645864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651920 (or 2651916 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 63645864 is about 7977.8357967559. The cubic root of 63645864 is about 399.2608516573.

The spelling of 63645864 in words is "sixty-three million, six hundred forty-five thousand, eight hundred sixty-four".