79999958 has 4 divisors (see below), whose sum is σ = 119999940. Its totient is φ = 39999978.

The previous prime is 79999879. The next prime is 79999973. The reversal of 79999958 is 85999997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85999997 = 6311 ⋅13627.

It is a junction number, because it is equal to n+sod(n) for n = 79999894 and 79999903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999988 + ... + 19999991.

It is an arithmetic number, because the mean of its divisors is an integer number (29999985).

Almost surely, 2^79999958 is an apocalyptic number.

79999958 is a deficient number, since it is larger than the sum of its proper divisors (39999982).

79999958 is a wasteful number, since it uses less digits than its factorization.

79999958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39999981.

The product of its digits is 16533720, while the sum is 65.

The square root of 79999958 is about 8944.2695621275. The cubic root of 79999958 is about 430.8868626011.

The spelling of 79999958 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred fifty-eight".