78688079 has 4 divisors (see below), whose sum is σ = 78798240. Its totient is φ = 78577920.

The previous prime is 78688073. The next prime is 78688097. The reversal of 78688079 is 97088687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78688079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78688079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78688073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54002 + ... + 55439.

It is an arithmetic number, because the mean of its divisors is an integer number (19699560).

Almost surely, 2^78688079 is an apocalyptic number.

78688079 is a deficient number, since it is larger than the sum of its proper divisors (110161).

78688079 is a wasteful number, since it uses less digits than its factorization.

78688079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110160.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 78688079 is about 8870.6301354526. The cubic root of 78688079 is about 428.5185707138.

The spelling of 78688079 in words is "seventy-eight million, six hundred eighty-eight thousand, seventy-nine".