78879279 has 16 divisors (see below), whose sum is σ = 111209600. Its totient is φ = 49592736.

The previous prime is 78879247. The next prime is 78879289. The reversal of 78879279 is 97297887.

It is not a de Polignac number, because 78879279 - 2⁵ = 78879247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78879289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10032 + ... + 16074.

It is an arithmetic number, because the mean of its divisors is an integer number (6950600).

Almost surely, 2^78879279 is an apocalyptic number.

78879279 is a deficient number, since it is larger than the sum of its proper divisors (32330321).

78879279 is a wasteful number, since it uses less digits than its factorization.

78879279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6294.

The product of its digits is 3556224, while the sum is 57.

The square root of 78879279 is about 8881.4007341185. The cubic root of 78879279 is about 428.8653681782.

The spelling of 78879279 in words is "seventy-eight million, eight hundred seventy-nine thousand, two hundred seventy-nine".