64287056865920 has 64 divisors (see below), whose sum is σ = 175641423235200. Its totient is φ = 22041276638208.

The previous prime is 64287056865907. The next prime is 64287056865937. The reversal of 64287056865920 is 2956865078246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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, 7174890260 + ... + 7174899219.

It is an arithmetic number, because the mean of its divisors is an integer number (2744397238050).

Almost surely, 2^{64287056865920} is an apocalyptic number.

It is an amenable number.

64287056865920 is an abundant number, since it is smaller than the sum of its proper divisors (111354366369280).

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

64287056865920 is a wasteful number, since it uses less digits than its factorization.

64287056865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14349789505 (or 14349789493 counting only the distinct ones).

The product of its (nonzero) digits is 348364800, while the sum is 68.

The spelling of 64287056865920 in words is "sixty-four trillion, two hundred eighty-seven billion, fifty-six million, eight hundred sixty-five thousand, nine hundred twenty".