79877197 has 4 divisors (see below), whose sum is σ = 84081280. Its totient is φ = 75673116.

The previous prime is 79877177. The next prime is 79877219. The reversal of 79877197 is 79177897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79877197 - 2⁷ = 79877069 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 (79877167) 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, 2102013 + ... + 2102050.

It is an arithmetic number, because the mean of its divisors is an integer number (21020320).

Almost surely, 2^79877197 is an apocalyptic number.

It is an amenable number.

79877197 is a deficient number, since it is larger than the sum of its proper divisors (4204083).

79877197 is a wasteful number, since it uses less digits than its factorization.

79877197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204082.

The product of its digits is 1555848, while the sum is 55.

The square root of 79877197 is about 8937.4043771108. The cubic root of 79877197 is about 430.6663492278. Note that the first 3 decimals are identical.

The spelling of 79877197 in words is "seventy-nine million, eight hundred seventy-seven thousand, one hundred ninety-seven".