79928591 has 4 divisors (see below), whose sum is σ = 80034384. Its totient is φ = 79822800.

The previous prime is 79928587. The next prime is 79928599. The reversal of 79928591 is 19582997.

It is a happy number.

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 79928591 - 2² = 79928587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79928599) 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, 51755 + ... + 53276.

It is an arithmetic number, because the mean of its divisors is an integer number (20008596).

Almost surely, 2^79928591 is an apocalyptic number.

79928591 is a deficient number, since it is larger than the sum of its proper divisors (105793).

79928591 is a wasteful number, since it uses less digits than its factorization.

79928591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105792.

The product of its digits is 408240, while the sum is 50.

The square root of 79928591 is about 8940.2791343447. The cubic root of 79928591 is about 430.7586948193.

The spelling of 79928591 in words is "seventy-nine million, nine hundred twenty-eight thousand, five hundred ninety-one".