79689217 has 4 divisors (see below), whose sum is σ = 84376836. Its totient is φ = 75001600.

The previous prime is 79689139. The next prime is 79689221. The reversal of 79689217 is 71298697.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59582961 + 20106256 = 7719^2 + 4484^2 .

It is a cyclic number.

It is not a de Polignac number, because 79689217 - 2²³ = 71300609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79689317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2343784 + ... + 2343817.

It is an arithmetic number, because the mean of its divisors is an integer number (21094209).

Almost surely, 2^79689217 is an apocalyptic number.

It is an amenable number.

79689217 is a deficient number, since it is larger than the sum of its proper divisors (4687619).

79689217 is a wasteful number, since it uses less digits than its factorization.

79689217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687618.

The product of its digits is 381024, while the sum is 49.

The square root of 79689217 is about 8926.8817063967. The cubic root of 79689217 is about 430.3282458503.

The spelling of 79689217 in words is "seventy-nine million, six hundred eighty-nine thousand, two hundred seventeen".