79899960 has 128 divisors (see below), whose sum is σ = 277908480. Its totient is φ = 17998848.

The previous prime is 79899947. The next prime is 79899961. The reversal of 79899960 is 6999897.

It is a self number, because there is not a number n which added to its sum of digits gives 79899960.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79899961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60669 + ... + 61971.

It is an arithmetic number, because the mean of its divisors is an integer number (2171160).

Almost surely, 2^79899960 is an apocalyptic number.

79899960 is a gapful number since it is divisible by the number (70) 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 79899960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138954240).

79899960 is an abundant number, since it is smaller than the sum of its proper divisors (198008520).

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

79899960 is a wasteful number, since it uses less digits than its factorization.

79899960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 57.

The square root of 79899960 is about 8938.6777545675. The cubic root of 79899960 is about 430.7072550490.

The spelling of 79899960 in words is "seventy-nine million, eight hundred ninety-nine thousand, nine hundred sixty".