78564879 has 12 divisors (see below), whose sum is σ = 113641632. Its totient is φ = 52303200.

The previous prime is 78564877. The next prime is 78564883. The reversal of 78564879 is 97846587.

78564879 is a `hidden beast` number, since 7 + 8 + 564 + 8 + 79 = 666.

It is not a de Polignac number, because 78564879 - 2¹ = 78564877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78564877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1114 + ... + 12584.

It is an arithmetic number, because the mean of its divisors is an integer number (9470136).

Almost surely, 2^78564879 is an apocalyptic number.

78564879 is a deficient number, since it is larger than the sum of its proper divisors (35076753).

78564879 is a wasteful number, since it uses less digits than its factorization.

78564879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12238 (or 12235 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 78564879 is about 8863.6831509255. The cubic root of 78564879 is about 428.2948135490.

The spelling of 78564879 in words is "seventy-eight million, five hundred sixty-four thousand, eight hundred seventy-nine".