638802780080 has 40 divisors (see below), whose sum is σ = 1499097011472. Its totient is φ = 253133060864.

The previous prime is 638802780073. The next prime is 638802780127. The reversal of 638802780080 is 80087208836.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37304687 + ... + 37321806.

Almost surely, 2^638802780080 is an apocalyptic number.

It is an amenable number.

638802780080 is an abundant number, since it is smaller than the sum of its proper divisors (860294231392).

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

638802780080 is a wasteful number, since it uses less digits than its factorization.

638802780080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74626613 (or 74626607 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 638802780080 in words is "six hundred thirty-eight billion, eight hundred two million, seven hundred eighty thousand, eighty".