638830205976 has 64 divisors (see below), whose sum is σ = 1658440113120. Its totient is φ = 204903751680.

The previous prime is 638830205957. The next prime is 638830205977. The reversal of 638830205976 is 679502038836.

It is a super-2 number, since 2×638830205976² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638830205977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4374865 + ... + 4518528.

Almost surely, 2^638830205976 is an apocalyptic number.

It is an amenable number.

638830205976 is an abundant number, since it is smaller than the sum of its proper divisors (1019609907144).

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

638830205976 is a wasteful number, since it uses less digits than its factorization.

638830205976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893516 (or 8893512 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 638830205976 in words is "six hundred thirty-eight billion, eight hundred thirty million, two hundred five thousand, nine hundred seventy-six".