79421440 has 112 divisors (see below), whose sum is σ = 218614752. Its totient is φ = 27131904.

The previous prime is 79421437. The next prime is 79421449. The reversal of 79421440 is 4412497.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79421449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286582 + ... + 286858.

Almost surely, 2^79421440 is an apocalyptic number.

79421440 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 79421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109307376).

79421440 is an abundant number, since it is smaller than the sum of its proper divisors (139193312).

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

79421440 is an equidigital number, since it uses as much as digits as its factorization.

79421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 79421440 is about 8911.8707351487. The cubic root of 79421440 is about 429.8456990993.

The spelling of 79421440 in words is "seventy-nine million, four hundred twenty-one thousand, four hundred forty".