79322779 has 4 divisors (see below), whose sum is σ = 79343784. Its totient is φ = 79301776.

The previous prime is 79322717. The next prime is 79322819. The reversal of 79322779 is 97722397.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97722397 = 3463 ⋅28219.

It is a cyclic number.

It is not a de Polignac number, because 79322779 - 2²⁵ = 45768347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79322179) 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, 3097 + ... + 12970.

It is an arithmetic number, because the mean of its divisors is an integer number (19835946).

Almost surely, 2^79322779 is an apocalyptic number.

79322779 is a deficient number, since it is larger than the sum of its proper divisors (21005).

79322779 is a wasteful number, since it uses less digits than its factorization.

79322779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004.

The product of its digits is 333396, while the sum is 46.

The square root of 79322779 is about 8906.3336452212. Note that the first 3 decimals coincide. The cubic root of 79322779 is about 429.6676339175.

The spelling of 79322779 in words is "seventy-nine million, three hundred twenty-two thousand, seven hundred seventy-nine".