79977997 has 16 divisors (see below), whose sum is σ = 89212032. Its totient is φ = 71089920.

The previous prime is 79977983. The next prime is 79978001.

79977997 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 79977997 - 2¹¹ = 79975949 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 (79977977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109648 + ... + 110374.

It is an arithmetic number, because the mean of its divisors is an integer number (5575752).

Almost surely, 2^79977997 is an apocalyptic number.

It is an amenable number.

79977997 is a deficient number, since it is larger than the sum of its proper divisors (9234035).

79977997 is a wasteful number, since it uses less digits than its factorization.

79977997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its digits is 15752961, while the sum is 64.

The square root of 79977997 is about 8943.0418203204. The cubic root of 79977997 is about 430.8474310288.

The spelling of 79977997 in words is "seventy-nine million, nine hundred seventy-seven thousand, nine hundred ninety-seven".