638863434804 has 48 divisors (see below), whose sum is σ = 1704249929088. Its totient is φ = 182466613248.

The previous prime is 638863434779. The next prime is 638863434827. The reversal of 638863434804 is 408434368836.

638863434804 is digitally balanced in base 2 and base 4, because in such bases 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 15 ways as a sum of consecutive naturals, for example, 1136109 + ... + 1602644.

It is an arithmetic number, because the mean of its divisors is an integer number (35505206856).

Almost surely, 2^638863434804 is an apocalyptic number.

It is an amenable number.

638863434804 is an abundant number, since it is smaller than the sum of its proper divisors (1065386494284).

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

638863434804 is a wasteful number, since it uses less digits than its factorization.

638863434804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741544 (or 2741542 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 57.

The spelling of 638863434804 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred thirty-four thousand, eight hundred four".