638236956876 has 48 divisors (see below), whose sum is σ = 1509742080000. Its totient is φ = 209814337152.

The previous prime is 638236956857. The next prime is 638236956901. The reversal of 638236956876 is 678659632836.

638236956876 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 638236956876.

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, 15396025 + ... + 15437423.

It is an arithmetic number, because the mean of its divisors is an integer number (31452960000).

Almost surely, 2^638236956876 is an apocalyptic number.

It is an amenable number.

638236956876 is an abundant number, since it is smaller than the sum of its proper divisors (871505123124).

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

638236956876 is a wasteful number, since it uses less digits than its factorization.

638236956876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59078 (or 59076 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 69.

The spelling of 638236956876 in words is "six hundred thirty-eight billion, two hundred thirty-six million, nine hundred fifty-six thousand, eight hundred seventy-six".