79404640 has 96 divisors (see below), whose sum is σ = 221405184. Its totient is φ = 26334720.

The previous prime is 79404631. The next prime is 79404641. The reversal of 79404640 is 4640497.

It is a junction number, because it is equal to n+sod(n) for n = 79404596 and 79404605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79404641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33577 + ... + 35863.

It is an arithmetic number, because the mean of its divisors is an integer number (2306304).

Almost surely, 2^79404640 is an apocalyptic number.

79404640 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 79404640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110702592).

79404640 is an abundant number, since it is smaller than the sum of its proper divisors (142000544).

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

79404640 is a wasteful number, since it uses less digits than its factorization.

79404640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340 (or 2332 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 79404640 is about 8910.9281222553. The cubic root of 79404640 is about 429.8153885728.

The spelling of 79404640 in words is "seventy-nine million, four hundred four thousand, six hundred forty".