79999579 has 4 divisors (see below), whose sum is σ = 87272280. Its totient is φ = 72726880.

The previous prime is 79999573. The next prime is 79999597. The reversal of 79999579 is 97599997.

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

It is a cyclic number.

It is not a de Polignac number, because 79999579 - 2³ = 79999571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79999579.

It is not an unprimeable number, because it can be changed into a prime (79999571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3636334 + ... + 3636355.

It is an arithmetic number, because the mean of its divisors is an integer number (21818070).

Almost surely, 2^79999579 is an apocalyptic number.

79999579 is a deficient number, since it is larger than the sum of its proper divisors (7272701).

79999579 is a wasteful number, since it uses less digits than its factorization.

79999579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7272700.

The product of its digits is 14467005, while the sum is 64.

The square root of 79999579 is about 8944.2483753527. The cubic root of 79999579 is about 430.8861821575.

It can be divided in two parts, 7999 and 9579, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 79999579 in words is "seventy-nine million, nine hundred ninety-nine thousand, five hundred seventy-nine".