638680828252 has 12 divisors (see below), whose sum is σ = 1117716939640. Its totient is φ = 319333131216.

The previous prime is 638680828241. The next prime is 638680828301. The reversal of 638680828252 is 252828086836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620978 + ... + 1976089.

Almost surely, 2^638680828252 is an apocalyptic number.

It is an amenable number.

638680828252 is a deficient number, since it is larger than the sum of its proper divisors (479036111388).

638680828252 is a wasteful number, since it uses less digits than its factorization.

638680828252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641460 (or 3641458 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 58.

The spelling of 638680828252 in words is "six hundred thirty-eight billion, six hundred eighty million, eight hundred twenty-eight thousand, two hundred fifty-two".