78686825 has 24 divisors (see below), whose sum is σ = 113415360. Its totient is φ = 53035200.

The previous prime is 78686813. The next prime is 78686851. The reversal of 78686825 is 52868687.

It is not a de Polignac number, because 78686825 - 2¹² = 78682729 is a prime.

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, 6515 + ... + 14135.

It is an arithmetic number, because the mean of its divisors is an integer number (4725640).

Almost surely, 2^78686825 is an apocalyptic number.

It is an amenable number.

78686825 is a deficient number, since it is larger than the sum of its proper divisors (34728535).

78686825 is a wasteful number, since it uses less digits than its factorization.

78686825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7697 (or 7692 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 78686825 is about 8870.5594524810. The cubic root of 78686825 is about 428.5162943625.

It can be divided in two parts, 7868682 and 5, that added together give a palindrome (7868687).

The spelling of 78686825 in words is "seventy-eight million, six hundred eighty-six thousand, eight hundred twenty-five".