79878539 has 16 divisors (see below), whose sum is σ = 87884832. Its totient is φ = 72154368.

The previous prime is 79878511. The next prime is 79878551. The reversal of 79878539 is 93587897.

It is not a de Polignac number, because 79878539 - 2⁸ = 79878283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79872539) 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, 255047 + ... + 255359.

It is an arithmetic number, because the mean of its divisors is an integer number (5492802).

Almost surely, 2^79878539 is an apocalyptic number.

79878539 is a deficient number, since it is larger than the sum of its proper divisors (8006293).

79878539 is a wasteful number, since it uses less digits than its factorization.

79878539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its digits is 3810240, while the sum is 56.

The square root of 79878539 is about 8937.4794545218. The cubic root of 79878539 is about 430.6687610592.

The spelling of 79878539 in words is "seventy-nine million, eight hundred seventy-eight thousand, five hundred thirty-nine".