78668759 has 12 divisors (see below), whose sum is σ = 89419176. Its totient is φ = 68791248.

The previous prime is 78668749. The next prime is 78668761. The reversal of 78668759 is 95786687.

It is a happy number.

It is not a de Polignac number, because 78668759 - 2⁴ = 78668743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3689 + ... + 13074.

It is an arithmetic number, because the mean of its divisors is an integer number (7451598).

Almost surely, 2^78668759 is an apocalyptic number.

78668759 is a deficient number, since it is larger than the sum of its proper divisors (10750417).

78668759 is a wasteful number, since it uses less digits than its factorization.

78668759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16814 (or 16795 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The square root of 78668759 is about 8869.5410817020. The cubic root of 78668759 is about 428.4834969706.

The spelling of 78668759 in words is "seventy-eight million, six hundred sixty-eight thousand, seven hundred fifty-nine".