78979911 has 16 divisors (see below), whose sum is σ = 107775360. Its totient is φ = 51428000.

The previous prime is 78979897. The next prime is 78979913. The reversal of 78979911 is 11997987.

It is a cyclic number.

It is not a de Polignac number, because 78979911 - 2⁷ = 78979783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38920 + ... + 40898.

It is an arithmetic number, because the mean of its divisors is an integer number (6735960).

Almost surely, 2^78979911 is an apocalyptic number.

78979911 is a deficient number, since it is larger than the sum of its proper divisors (28795449).

78979911 is a wasteful number, since it uses less digits than its factorization.

78979911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286.

The product of its digits is 285768, while the sum is 51.

The square root of 78979911 is about 8887.0642509211. The cubic root of 78979911 is about 429.0476688626.

The spelling of 78979911 in words is "seventy-eight million, nine hundred seventy-nine thousand, nine hundred eleven".