638611600264 has 32 divisors (see below), whose sum is σ = 1375001056800. Its totient is φ = 275000209920.

The previous prime is 638611600243. The next prime is 638611600309. The reversal of 638611600264 is 462006116836.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 638611600264.

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, 190970697 + ... + 190974040.

It is an arithmetic number, because the mean of its divisors is an integer number (42968783025).

Almost surely, 2^638611600264 is an apocalyptic number.

It is an amenable number.

638611600264 is an abundant number, since it is smaller than the sum of its proper divisors (736389456536).

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

638611600264 is a wasteful number, since it uses less digits than its factorization.

638611600264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381944773 (or 381944769 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 638611600264 in words is "six hundred thirty-eight billion, six hundred eleven million, six hundred thousand, two hundred sixty-four".