79979819904 has 160 divisors (see below), whose sum is σ = 240888934440. Its totient is φ = 26338452480.

The previous prime is 79979819903. The next prime is 79979819911. The reversal of 79979819904 is 40991897997.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79979819903) 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 19 ways as a sum of consecutive naturals, for example, 814074 + ... + 907014.

Almost surely, 2^79979819904 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 79979819904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120444467220).

79979819904 is an abundant number, since it is smaller than the sum of its proper divisors (160909114536).

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

79979819904 is an equidigital number, since it uses as much as digits as its factorization.

79979819904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93050 (or 93029 counting only the distinct ones).

The product of its (nonzero) digits is 92588832, while the sum is 72.

The spelling of 79979819904 in words is "seventy-nine billion, nine hundred seventy-nine million, eight hundred nineteen thousand, nine hundred four".