638376673836 has 24 divisors (see below), whose sum is σ = 1624958806464. Its totient is φ = 193447476880.

The previous prime is 638376673813. The next prime is 638376673967.

638376673836 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418093330 + ... + 2418093593.

It is an arithmetic number, because the mean of its divisors is an integer number (67706616936).

Almost surely, 2^638376673836 is an apocalyptic number.

638376673836 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

638376673836 is an abundant number, since it is smaller than the sum of its proper divisors (986582132628).

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

638376673836 is a wasteful number, since it uses less digits than its factorization.

638376673836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4836186941 (or 4836186939 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 66.

The spelling of 638376673836 in words is "six hundred thirty-eight billion, three hundred seventy-six million, six hundred seventy-three thousand, eight hundred thirty-six".