879663398672 has 20 divisors (see below), whose sum is σ = 1704439493340. Its totient is φ = 439808045568.

The previous prime is 879663398641. The next prime is 879663398707. The reversal of 879663398672 is 276893366978.

It can be written as a sum of positive squares in 2 ways, for example, as 337472693776 + 542190704896 = 580924^2 + 736336^2 .

It is a super-2 number, since 2×879663398672² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 879663398672.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169597 + ... + 1768412.

It is an arithmetic number, because the mean of its divisors is an integer number (85221974667).

Almost surely, 2^879663398672 is an apocalyptic number.

It is an amenable number.

879663398672 is a deficient number, since it is larger than the sum of its proper divisors (824776094668).

879663398672 is a wasteful number, since it uses less digits than its factorization.

879663398672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956730 (or 2956724 counting only the distinct ones).

The product of its digits is 987614208, while the sum is 74.

The spelling of 879663398672 in words is "eight hundred seventy-nine billion, six hundred sixty-three million, three hundred ninety-eight thousand, six hundred seventy-two".