79664440 has 32 divisors (see below), whose sum is σ = 179506080. Its totient is φ = 31819392.

The previous prime is 79664419. The next prime is 79664443. The reversal of 79664440 is 4446697.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 79664393 and 79664402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79664443) 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, 43789 + ... + 45571.

It is an arithmetic number, because the mean of its divisors is an integer number (5609565).

Almost surely, 2^79664440 is an apocalyptic number.

It is an amenable number.

79664440 is an abundant number, since it is smaller than the sum of its proper divisors (99841640).

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

79664440 is a wasteful number, since it uses less digits than its factorization.

79664440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2907 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 79664440 is about 8925.4938238733. The cubic root of 79664440 is about 430.2836419562.

The spelling of 79664440 in words is "seventy-nine million, six hundred sixty-four thousand, four hundred forty".