638612160780 has 96 divisors (see below), whose sum is σ = 1953822447360. Its totient is φ = 154564865280.

The previous prime is 638612160727. The next prime is 638612160799. The reversal of 638612160780 is 87061216836.

It is a super-2 number, since 2×638612160780² (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 (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373039 + ... + 1190118.

It is an arithmetic number, because the mean of its divisors is an integer number (20352317160).

Almost surely, 2^638612160780 is an apocalyptic number.

638612160780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638612160780 is an abundant number, since it is smaller than the sum of its proper divisors (1315210286580).

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

638612160780 is a wasteful number, since it uses less digits than its factorization.

638612160780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563799 (or 1563797 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 638612160780 in words is "six hundred thirty-eight billion, six hundred twelve million, one hundred sixty thousand, seven hundred eighty".