79977879 has 24 divisors (see below), whose sum is σ = 119688192. Its totient is φ = 51429840.

The previous prime is 79977857. The next prime is 79977883. The reversal of 79977879 is 97877997.

It is not a de Polignac number, because 79977879 - 2⁵ = 79977847 is a prime.

It is a super-2 number, since 2×79977879² = 12792922258677282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79977829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28702 + ... + 31364.

It is an arithmetic number, because the mean of its divisors is an integer number (4987008).

Almost surely, 2^79977879 is an apocalyptic number.

79977879 is a deficient number, since it is larger than the sum of its proper divisors (39710313).

79977879 is a wasteful number, since it uses less digits than its factorization.

79977879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787 (or 2784 counting only the distinct ones).

The product of its digits is 14002632, while the sum is 63.

The square root of 79977879 is about 8943.0352230101. The cubic root of 79977879 is about 430.8472191371.

It can be divided in two parts, 7997 and 7879, that added together give a square (15876 = 126²).

The spelling of 79977879 in words is "seventy-nine million, nine hundred seventy-seven thousand, eight hundred seventy-nine".