79720992 has 144 divisors (see below), whose sum is σ = 247665600. Its totient is φ = 24178176.

The previous prime is 79720969. The next prime is 79720997. The reversal of 79720992 is 29902797.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (79720997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 400509 + ... + 400707.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^79720992 is an apocalyptic number.

79720992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79720992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123832800).

79720992 is an abundant number, since it is smaller than the sum of its proper divisors (167944608).

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

79720992 is a wasteful number, since it uses less digits than its factorization.

79720992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 79720992 is about 8928.6612658338. The cubic root of 79720992 is about 430.3854341104.

The spelling of 79720992 in words is "seventy-nine million, seven hundred twenty thousand, nine hundred ninety-two".