79622721 has 12 divisors (see below), whose sum is σ = 115125348. Its totient is φ = 53028864.

The previous prime is 79622701. The next prime is 79622723. The reversal of 79622721 is 12722697.

79622721 is a `hidden beast` number, since 7 + 9 + 622 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56927025 + 22695696 = 7545^2 + 4764^2 .

It is not a de Polignac number, because 79622721 - 2⁹ = 79622209 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (79622723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6541 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (9593779).

Almost surely, 2^79622721 is an apocalyptic number.

It is an amenable number.

79622721 is a deficient number, since it is larger than the sum of its proper divisors (35502627).

79622721 is a wasteful number, since it uses less digits than its factorization.

79622721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832 (or 8829 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 79622721 is about 8923.1564482531. The cubic root of 79622721 is about 430.2085179414.

The spelling of 79622721 in words is "seventy-nine million, six hundred twenty-two thousand, seven hundred twenty-one".