638820330862 has 64 divisors (see below), whose sum is σ = 1154052956160. Its totient is φ = 259285584096.

The previous prime is 638820330773. The next prime is 638820330961. The reversal of 638820330862 is 268033028836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80583943 + ... + 80591869.

It is an arithmetic number, because the mean of its divisors is an integer number (18032077440).

Almost surely, 2^638820330862 is an apocalyptic number.

638820330862 is a deficient number, since it is larger than the sum of its proper divisors (515232625298).

638820330862 is a wasteful number, since it uses less digits than its factorization.

638820330862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10405.

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 638820330862 in words is "six hundred thirty-eight billion, eight hundred twenty million, three hundred thirty thousand, eight hundred sixty-two".