79704640 has 56 divisors (see below), whose sum is σ = 190789560. Its totient is φ = 31715328.

The previous prime is 79704631. The next prime is 79704641. The reversal of 79704640 is 4640797.

It can be written as a sum of positive squares in 4 ways, for example, as 1700416 + 78004224 = 1304^2 + 8832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79704640.

It is not an unprimeable number, because it can be changed into a prime (79704641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74026 + ... + 75094.

Almost surely, 2^79704640 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 79704640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95394780).

79704640 is an abundant number, since it is smaller than the sum of its proper divisors (111084920).

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

79704640 is a wasteful number, since it uses less digits than its factorization.

79704640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 79704640 is about 8927.7455160864. The cubic root of 79704640 is about 430.3560058771.

The spelling of 79704640 in words is "seventy-nine million, seven hundred four thousand, six hundred forty".