79821164 has 6 divisors (see below), whose sum is σ = 139687044. Its totient is φ = 39910580.

The previous prime is 79821149. The next prime is 79821191. The reversal of 79821164 is 46112897.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977642 + ... + 9977649.

It is an arithmetic number, because the mean of its divisors is an integer number (23281174).

Almost surely, 2^79821164 is an apocalyptic number.

It is an amenable number.

79821164 is a deficient number, since it is larger than the sum of its proper divisors (59865880).

79821164 is a wasteful number, since it uses less digits than its factorization.

79821164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19955295 (or 19955293 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 79821164 is about 8934.2690803445. The cubic root of 79821164 is about 430.5656230576.

The spelling of 79821164 in words is "seventy-nine million, eight hundred twenty-one thousand, one hundred sixty-four".