79217172 has 36 divisors (see below), whose sum is σ = 200540340. Its totient is φ = 26366592.

The previous prime is 79217153. The next prime is 79217179. The reversal of 79217172 is 27171297.

It can be written as a sum of positive squares in 2 ways, for example, as 50637456 + 28579716 = 7116^2 + 5346^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79217179) 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, 33154 + ... + 35462.

It is an arithmetic number, because the mean of its divisors is an integer number (5570565).

Almost surely, 2^79217172 is an apocalyptic number.

It is an amenable number.

79217172 is an abundant number, since it is smaller than the sum of its proper divisors (121323168).

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

79217172 is a wasteful number, since it uses less digits than its factorization.

79217172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272 (or 3267 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 79217172 is about 8900.4029122282. The cubic root of 79217172 is about 429.4768687825.

The spelling of 79217172 in words is "seventy-nine million, two hundred seventeen thousand, one hundred seventy-two".