78679379 has 4 divisors (see below), whose sum is σ = 80509176. Its totient is φ = 76849584.

The previous prime is 78679309. The next prime is 78679387. The reversal of 78679379 is 97397687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97397687 = 401 ⋅242887.

It is a cyclic number.

It is not a de Polignac number, because 78679379 - 2²⁰ = 77630803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78679309) 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, 914834 + ... + 914919.

It is an arithmetic number, because the mean of its divisors is an integer number (20127294).

Almost surely, 2^78679379 is an apocalyptic number.

78679379 is a deficient number, since it is larger than the sum of its proper divisors (1829797).

78679379 is a wasteful number, since it uses less digits than its factorization.

78679379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829796.

The product of its digits is 4000752, while the sum is 56.

The square root of 78679379 is about 8870.1397395982. The cubic root of 78679379 is about 428.5027773475.

The spelling of 78679379 in words is "seventy-eight million, six hundred seventy-nine thousand, three hundred seventy-nine".