638764735552 has 112 divisors (see below), whose sum is σ = 1345539600000. Its totient is φ = 300022493184.

The previous prime is 638764735493. The next prime is 638764735613. The reversal of 638764735552 is 255537467836.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117223324 + ... + 117228772.

Almost surely, 2^638764735552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638764735552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672769800000).

638764735552 is an abundant number, since it is smaller than the sum of its proper divisors (706774864448).

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

638764735552 is a wasteful number, since it uses less digits than its factorization.

638764735552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6276 (or 6266 counting only the distinct ones).

The product of its digits is 127008000, while the sum is 61.

The spelling of 638764735552 in words is "six hundred thirty-eight billion, seven hundred sixty-four million, seven hundred thirty-five thousand, five hundred fifty-two".