78316689 has 16 divisors (see below), whose sum is σ = 119911680. Its totient is φ = 44966160.

The previous prime is 78316687. The next prime is 78316697. The reversal of 78316689 is 98661387.

It is not a de Polignac number, because 78316689 - 2¹ = 78316687 is a prime.

It is a super-2 number, since 2×78316689² = 12267007551845442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78316681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61827 + ... + 63080.

It is an arithmetic number, because the mean of its divisors is an integer number (7494480).

Almost surely, 2^78316689 is an apocalyptic number.

It is an amenable number.

78316689 is a deficient number, since it is larger than the sum of its proper divisors (41594991).

78316689 is a wasteful number, since it uses less digits than its factorization.

78316689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124940.

The product of its digits is 435456, while the sum is 48.

The square root of 78316689 is about 8849.6716888255. The cubic root of 78316689 is about 427.8433369185.

The spelling of 78316689 in words is "seventy-eight million, three hundred sixteen thousand, six hundred eighty-nine".