79909400 has 48 divisors (see below), whose sum is σ = 189764640. Its totient is φ = 31280000.

The previous prime is 79909399. The next prime is 79909433. The reversal of 79909400 is 490997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5150 + ... + 13650.

It is an arithmetic number, because the mean of its divisors is an integer number (3953430).

Almost surely, 2^79909400 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 79909400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94882320).

79909400 is an abundant number, since it is smaller than the sum of its proper divisors (109855240).

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

79909400 is a wasteful number, since it uses less digits than its factorization.

79909400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564 (or 8555 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 79909400 is about 8939.2057812761. The cubic root of 79909400 is about 430.7242167445.

The spelling of 79909400 in words is "seventy-nine million, nine hundred nine thousand, four hundred".