79707240 has 160 divisors (see below), whose sum is σ = 272380680. Its totient is φ = 20901888.

The previous prime is 79707211. The next prime is 79707247. The reversal of 79707240 is 4270797.

It can be written as a sum of positive squares in 4 ways, for example, as 57972996 + 21734244 = 7614^2 + 4662^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 79707195 and 79707204.

It is not an unprimeable number, because it can be changed into a prime (79707247) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 236352 + ... + 236688.

Almost surely, 2^79707240 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 79707240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136190340).

79707240 is an abundant number, since it is smaller than the sum of its proper divisors (192673440).

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

79707240 is a wasteful number, since it uses less digits than its factorization.

79707240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 79707240 is about 8927.8911283684. The cubic root of 79707240 is about 430.3606852929.

The spelling of 79707240 in words is "seventy-nine million, seven hundred seven thousand, two hundred forty".