7899371992 has 32 divisors (see below), whose sum is σ = 14887797120. Its totient is φ = 3929333760.

The previous prime is 7899371989. The next prime is 7899372059. The reversal of 7899371992 is 2991739987.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 2035558 + ... + 2039434.

It is an arithmetic number, because the mean of its divisors is an integer number (465243660).

Almost surely, 2^7899371992 is an apocalyptic number.

It is an amenable number.

7899371992 is a deficient number, since it is larger than the sum of its proper divisors (6988425128).

7899371992 is a wasteful number, since it uses less digits than its factorization.

7899371992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131 (or 5127 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 64.

The square root of 7899371992 is about 88878.4112819306. The cubic root of 7899371992 is about 1991.5789251808.

The spelling of 7899371992 in words is "seven billion, eight hundred ninety-nine million, three hundred seventy-one thousand, nine hundred ninety-two".