638674788024 has 96 divisors (see below), whose sum is σ = 2128915981920. Its totient is φ = 168441700608.

The previous prime is 638674788023. The next prime is 638674788029. The reversal of 638674788024 is 420887476836.

638674788024 is a `hidden beast` number, since 6 + 3 + 8 + 67 + 478 + 80 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638674788023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48732367 + ... + 48745470.

It is an arithmetic number, because the mean of its divisors is an integer number (22176208145).

Almost surely, 2^638674788024 is an apocalyptic number.

It is an amenable number.

638674788024 is an abundant number, since it is smaller than the sum of its proper divisors (1490241193896).

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

638674788024 is a wasteful number, since it uses less digits than its factorization.

638674788024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97477869 (or 97477862 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 63.

The spelling of 638674788024 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred eighty-eight thousand, twenty-four".