638825771408 has 40 divisors (see below), whose sum is σ = 1350776044800. Its totient is φ = 290261229440.

The previous prime is 638825771387. The next prime is 638825771413. The reversal of 638825771408 is 804177528836.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263360 + ... + 1160607.

It is an arithmetic number, because the mean of its divisors is an integer number (33769401120).

Almost surely, 2^638825771408 is an apocalyptic number.

It is an amenable number.

638825771408 is an abundant number, since it is smaller than the sum of its proper divisors (711950273392).

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

638825771408 is a wasteful number, since it uses less digits than its factorization.

638825771408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426535 (or 1426529 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 59.

The spelling of 638825771408 in words is "six hundred thirty-eight billion, eight hundred twenty-five million, seven hundred seventy-one thousand, four hundred eight".