78868685 has 24 divisors (see below), whose sum is σ = 111362040. Its totient is φ = 53458944.

The previous prime is 78868637. The next prime is 78868709. The reversal of 78868685 is 58686887.

It can be written as a sum of positive squares in 4 ways, for example, as 3161284 + 75707401 = 1778^2 + 8701^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78868685 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78868685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19997 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (4640085).

Almost surely, 2^78868685 is an apocalyptic number.

It is an amenable number.

78868685 is a deficient number, since it is larger than the sum of its proper divisors (32493355).

78868685 is a wasteful number, since it uses less digits than its factorization.

78868685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725 (or 3718 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 56.

The square root of 78868685 is about 8880.8042991612. The cubic root of 78868685 is about 428.8461675161.

The spelling of 78868685 in words is "seventy-eight million, eight hundred sixty-eight thousand, six hundred eighty-five".