79845640 has 64 divisors (see below), whose sum is σ = 206530560. Its totient is φ = 27214080.

The previous prime is 79845611. The next prime is 79845641. The reversal of 79845640 is 4654897.

It is not an unprimeable number, because it can be changed into a prime (79845641) 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, 52734 + ... + 54226.

It is an arithmetic number, because the mean of its divisors is an integer number (3227040).

Almost surely, 2^79845640 is an apocalyptic number.

79845640 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 79845640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103265280).

79845640 is an abundant number, since it is smaller than the sum of its proper divisors (126684920).

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

79845640 is a wasteful number, since it uses less digits than its factorization.

79845640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 79845640 is about 8935.6387572462. The cubic root of 79845640 is about 430.6096274573.

The spelling of 79845640 in words is "seventy-nine million, eight hundred forty-five thousand, six hundred forty".