638927099874 has 32 divisors (see below), whose sum is σ = 1622672000640. Its totient is φ = 182550599856.

The previous prime is 638927099873. The next prime is 638927099939. The reversal of 638927099874 is 478990729836.

It is not an unprimeable number, because it can be changed into a prime (638927099873) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 845141289 + ... + 845142044.

It is an arithmetic number, because the mean of its divisors is an integer number (50708500020).

Almost surely, 2^638927099874 is an apocalyptic number.

638927099874 is an abundant number, since it is smaller than the sum of its proper divisors (983744900766).

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

638927099874 is a wasteful number, since it uses less digits than its factorization.

638927099874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690283351 (or 1690283345 counting only the distinct ones).

The product of its (nonzero) digits is 329204736, while the sum is 72.

The spelling of 638927099874 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, ninety-nine thousand, eight hundred seventy-four".