78423685 has 32 divisors (see below), whose sum is σ = 101088000. Its totient is φ = 58308096.

The previous prime is 78423679. The next prime is 78423691. The reversal of 78423685 is 58632487.

It is an interprime number because it is at equal distance from previous prime (78423679) and next prime (78423691).

It is not a de Polignac number, because 78423685 - 2⁹ = 78423173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 761344 + ... + 761446.

It is an arithmetic number, because the mean of its divisors is an integer number (3159000).

Almost surely, 2^78423685 is an apocalyptic number.

It is an amenable number.

78423685 is a deficient number, since it is larger than the sum of its proper divisors (22664315).

78423685 is a wasteful number, since it uses less digits than its factorization.

78423685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its digits is 322560, while the sum is 43.

The square root of 78423685 is about 8855.7148215150. The cubic root of 78423685 is about 428.0380876374.

The spelling of 78423685 in words is "seventy-eight million, four hundred twenty-three thousand, six hundred eighty-five".