638820132500 has 60 divisors (see below), whose sum is σ = 1523969373696. Its totient is φ = 232298220000.

The previous prime is 638820132463. The next prime is 638820132521. The reversal of 638820132500 is 5231028836.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 11587412 + ... + 11642411.

Almost surely, 2^638820132500 is an apocalyptic number.

It is an amenable number.

638820132500 is an abundant number, since it is smaller than the sum of its proper divisors (885149241196).

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

638820132500 is a wasteful number, since it uses less digits than its factorization.

638820132500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23229858 (or 23229841 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 638820132500 in words is "six hundred thirty-eight billion, eight hundred twenty million, one hundred thirty-two thousand, five hundred".