638116486280 has 64 divisors (see below), whose sum is σ = 1767091818240. Its totient is φ = 201953348352.

The previous prime is 638116486279. The next prime is 638116486321. The reversal of 638116486280 is 82684611836.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87649724 + ... + 87657003.

It is an arithmetic number, because the mean of its divisors is an integer number (27610809660).

Almost surely, 2^638116486280 is an apocalyptic number.

It is an amenable number.

638116486280 is an abundant number, since it is smaller than the sum of its proper divisors (1128975331960).

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

638116486280 is a wasteful number, since it uses less digits than its factorization.

638116486280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175306758 (or 175306754 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 638116486280 in words is "six hundred thirty-eight billion, one hundred sixteen million, four hundred eighty-six thousand, two hundred eighty".