78665379 has 16 divisors (see below), whose sum is σ = 113175552. Its totient is φ = 48315168.

The previous prime is 78665329. The next prime is 78665381. The reversal of 78665379 is 97356687.

It is not a de Polignac number, because 78665379 - 2⁸ = 78665123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78665329) 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, 22012 + ... + 25334.

It is an arithmetic number, because the mean of its divisors is an integer number (7073472).

Almost surely, 2^78665379 is an apocalyptic number.

78665379 is a deficient number, since it is larger than the sum of its proper divisors (34510173).

78665379 is a wasteful number, since it uses less digits than its factorization.

78665379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946.

The product of its digits is 1905120, while the sum is 51.

The square root of 78665379 is about 8869.3505399212. The cubic root of 78665379 is about 428.4773602907.

The spelling of 78665379 in words is "seventy-eight million, six hundred sixty-five thousand, three hundred seventy-nine".