638856676 has 24 divisors (see below), whose sum is σ = 1155137984. Its totient is φ = 308962080.

The previous prime is 638856667. The next prime is 638856677. The reversal of 638856676 is 676658836.

It is not an unprimeable number, because it can be changed into a prime (638856677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315 + ... + 35746.

Almost surely, 2^638856676 is an apocalyptic number.

It is an amenable number.

638856676 is a deficient number, since it is larger than the sum of its proper divisors (516281308).

638856676 is a wasteful number, since it uses less digits than its factorization.

638856676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36211 (or 36209 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The square root of 638856676 is about 25275.6142556417. The cubic root of 638856676 is about 861.2603999410.

The spelling of 638856676 in words is "six hundred thirty-eight million, eight hundred fifty-six thousand, six hundred seventy-six".