79721877 has 8 divisors (see below), whose sum is σ = 106340416. Its totient is φ = 53125632.

The previous prime is 79721843. The next prime is 79721881. The reversal of 79721877 is 77812797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79721877 - 2¹⁵ = 79689109 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 (79721827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6528 + ... + 14214.

It is an arithmetic number, because the mean of its divisors is an integer number (13292552).

Almost surely, 2^79721877 is an apocalyptic number.

It is an amenable number.

79721877 is a deficient number, since it is larger than the sum of its proper divisors (26618539).

79721877 is a wasteful number, since it uses less digits than its factorization.

79721877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11147.

The product of its digits is 345744, while the sum is 48.

The square root of 79721877 is about 8928.7108251976. The cubic root of 79721877 is about 430.3870267052.

The spelling of 79721877 in words is "seventy-nine million, seven hundred twenty-one thousand, eight hundred seventy-seven".