638372407388 has 12 divisors (see below), whose sum is σ = 1119883138080. Its totient is φ = 318405796512.

The previous prime is 638372407367. The next prime is 638372407391. The reversal of 638372407388 is 883704273836.

638372407388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195099956 + ... + 195103227.

It is an arithmetic number, because the mean of its divisors is an integer number (93323594840).

Almost surely, 2^638372407388 is an apocalyptic number.

It is an amenable number.

638372407388 is a deficient number, since it is larger than the sum of its proper divisors (481510730692).

638372407388 is a wasteful number, since it uses less digits than its factorization.

638372407388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390203596 (or 390203594 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 59.

The spelling of 638372407388 in words is "six hundred thirty-eight billion, three hundred seventy-two million, four hundred seven thousand, three hundred eighty-eight".