79999971 has 8 divisors (see below), whose sum is σ = 106716864. Its totient is φ = 53308200.

The previous prime is 79999879. The next prime is 79999973. The reversal of 79999971 is 17999997.

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

It is not a de Polignac number, because 79999971 - 2¹⁵ = 79967203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79999973) 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, 3196 + ... + 13046.

It is an arithmetic number, because the mean of its divisors is an integer number (13339608).

Almost surely, 2^79999971 is an apocalyptic number.

79999971 is a deficient number, since it is larger than the sum of its proper divisors (26716893).

79999971 is a wasteful number, since it uses less digits than its factorization.

79999971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561.

The product of its digits is 2893401, while the sum is 60.

The square root of 79999971 is about 8944.2702888497. The cubic root of 79999971 is about 430.8868859409.

The spelling of 79999971 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".