79899860 has 12 divisors (see below), whose sum is σ = 167789748. Its totient is φ = 31959936.

The previous prime is 79899811. The next prime is 79899863. The reversal of 79899860 is 6899897.

It can be written as a sum of positive squares in 2 ways, for example, as 56821444 + 23078416 = 7538^2 + 4804^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79899796 and 79899805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79899863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997477 + ... + 1997516.

It is an arithmetic number, because the mean of its divisors is an integer number (13982479).

Almost surely, 2^79899860 is an apocalyptic number.

It is an amenable number.

79899860 is an abundant number, since it is smaller than the sum of its proper divisors (87889888).

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

79899860 is a wasteful number, since it uses less digits than its factorization.

79899860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995002 (or 3995000 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 79899860 is about 8938.6721608973. The cubic root of 79899860 is about 430.7070753629.

The spelling of 79899860 in words is "seventy-nine million, eight hundred ninety-nine thousand, eight hundred sixty".