78512685 has 32 divisors (see below), whose sum is σ = 132606720. Its totient is φ = 39587328.

The previous prime is 78512683. The next prime is 78512689. The reversal of 78512685 is 58621587.

It is not a de Polignac number, because 78512685 - 2¹ = 78512683 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78512683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29427 + ... + 31983.

It is an arithmetic number, because the mean of its divisors is an integer number (4143960).

Almost surely, 2^78512685 is an apocalyptic number.

It is an amenable number.

78512685 is a deficient number, since it is larger than the sum of its proper divisors (54094035).

78512685 is a wasteful number, since it uses less digits than its factorization.

78512685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677.

The product of its digits is 134400, while the sum is 42.

The square root of 78512685 is about 8860.7384003818. The cubic root of 78512685 is about 428.1999477008.

It can be divided in two parts, 78512 and 685, that added together give a palindrome (79197).

The spelling of 78512685 in words is "seventy-eight million, five hundred twelve thousand, six hundred eighty-five".