638927099880 has 32 divisors (see below), whose sum is σ = 1916781300000. Its totient is φ = 170380559936.

The previous prime is 638927099873. The next prime is 638927099939. The reversal of 638927099880 is 88990729836.

It is a super-2 number, since 2×638927099880² (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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2662196130 + ... + 2662196369.

It is an arithmetic number, because the mean of its divisors is an integer number (59899415625).

Almost surely, 2^638927099880 is an apocalyptic number.

638927099880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638927099880 is an abundant number, since it is smaller than the sum of its proper divisors (1277854200120).

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

638927099880 is a wasteful number, since it uses less digits than its factorization.

638927099880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324392513 (or 5324392509 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 69.

The spelling of 638927099880 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, ninety-nine thousand, eight hundred eighty".