79564221 has 16 divisors (see below), whose sum is σ = 128589120. Its totient is φ = 48220560.

The previous prime is 79564217. The next prime is 79564241. The reversal of 79564221 is 12246597.

79564221 is a `hidden beast` number, since 7 + 9 + 5 + 642 + 2 + 1 = 666.

It is not a de Polignac number, because 79564221 - 2² = 79564217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79564211) 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, 133650 + ... + 134243.

It is an arithmetic number, because the mean of its divisors is an integer number (8036820).

Almost surely, 2^79564221 is an apocalyptic number.

It is an amenable number.

79564221 is a deficient number, since it is larger than the sum of its proper divisors (49024899).

79564221 is a wasteful number, since it uses less digits than its factorization.

79564221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267913 (or 267907 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 79564221 is about 8919.8778579081. The cubic root of 79564221 is about 430.1031319239.

The spelling of 79564221 in words is "seventy-nine million, five hundred sixty-four thousand, two hundred twenty-one".