638674788008 has 32 divisors (see below), whose sum is σ = 1242077652000. Its totient is φ = 307512192960.

The previous prime is 638674788001. The next prime is 638674788023. The reversal of 638674788008 is 800887476836.

It is not an unprimeable number, because it can be changed into a prime (638674788001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3543878 + ... + 3719733.

It is an arithmetic number, because the mean of its divisors is an integer number (38814926625).

Almost surely, 2^638674788008 is an apocalyptic number.

It is an amenable number.

638674788008 is a deficient number, since it is larger than the sum of its proper divisors (603402863992).

638674788008 is a wasteful number, since it uses less digits than its factorization.

638674788008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264025 (or 7264021 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 65.

The spelling of 638674788008 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred eighty-eight thousand, eight".