638823846544 has 40 divisors (see below), whose sum is σ = 1336562648960. Its totient is φ = 294038356608.

The previous prime is 638823846407. The next prime is 638823846571. The reversal of 638823846544 is 445648328836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4107954 + ... + 4260625.

It is an arithmetic number, because the mean of its divisors is an integer number (33414066224).

Almost surely, 2^638823846544 is an apocalyptic number.

It is an amenable number.

638823846544 is an abundant number, since it is smaller than the sum of its proper divisors (697738802416).

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

638823846544 is a wasteful number, since it uses less digits than its factorization.

638823846544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8368967 (or 8368961 counting only the distinct ones).

The product of its digits is 106168320, while the sum is 61.

The spelling of 638823846544 in words is "six hundred thirty-eight billion, eight hundred twenty-three million, eight hundred forty-six thousand, five hundred forty-four".