79421904 has 80 divisors (see below), whose sum is σ = 229618240. Its totient is φ = 26282880.

The previous prime is 79421887. The next prime is 79421911. The reversal of 79421904 is 40912497.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67239 + ... + 68409.

It is an arithmetic number, because the mean of its divisors is an integer number (2870228).

Almost surely, 2^79421904 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 79421904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114809120).

79421904 is an abundant number, since it is smaller than the sum of its proper divisors (150196336).

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

79421904 is a wasteful number, since it uses less digits than its factorization.

79421904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 79421904 is about 8911.8967678043. The cubic root of 79421904 is about 429.8465361865.

The spelling of 79421904 in words is "seventy-nine million, four hundred twenty-one thousand, nine hundred four".