79839199992 has 128 divisors (see below), whose sum is σ = 209139840000. Its totient is φ = 25375223808.

The previous prime is 79839199991. The next prime is 79839200011. The reversal of 79839199992 is 29999193897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79839199991) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8867509 + ... + 8876507.

It is an arithmetic number, because the mean of its divisors is an integer number (1633905000).

Almost surely, 2^79839199992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79839199992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104569920000).

79839199992 is an abundant number, since it is smaller than the sum of its proper divisors (129300640008).

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

79839199992 is a wasteful number, since it uses less digits than its factorization.

79839199992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9245 (or 9241 counting only the distinct ones).

The product of its digits is 178564176, while the sum is 75.

The spelling of 79839199992 in words is "seventy-nine billion, eight hundred thirty-nine million, one hundred ninety-nine thousand, nine hundred ninety-two".