638037687372 has 48 divisors (see below), whose sum is σ = 1491306144384. Its totient is φ = 212315040000.

The previous prime is 638037687367. The next prime is 638037687401. The reversal of 638037687372 is 273786730836.

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, 17146347 + ... + 17183517.

It is an arithmetic number, because the mean of its divisors is an integer number (31068878008).

Almost surely, 2^638037687372 is an apocalyptic number.

It is an amenable number.

638037687372 is an abundant number, since it is smaller than the sum of its proper divisors (853268457012).

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

638037687372 is a wasteful number, since it uses less digits than its factorization.

638037687372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39590 (or 39588 counting only the distinct ones).

The product of its (nonzero) digits is 42674688, while the sum is 60.

The spelling of 638037687372 in words is "six hundred thirty-eight billion, thirty-seven million, six hundred eighty-seven thousand, three hundred seventy-two".