638702423364 has 24 divisors (see below), whose sum is σ = 1490464410400. Its totient is φ = 212878128384.

The previous prime is 638702423341. The next prime is 638702423453. The reversal of 638702423364 is 463324207836.

It is a super-2 number, since 2×638702423364² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2717389 + ... + 2943060.

Almost surely, 2^638702423364 is an apocalyptic number.

It is an amenable number.

638702423364 is an abundant number, since it is smaller than the sum of its proper divisors (851761987036).

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

638702423364 is a wasteful number, since it uses less digits than its factorization.

638702423364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669859 (or 5669857 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 48.

The spelling of 638702423364 in words is "six hundred thirty-eight billion, seven hundred two million, four hundred twenty-three thousand, three hundred sixty-four".