78868079 has 2 divisors, whose sum is σ = 78868080. Its totient is φ = 78868078.

The previous prime is 78868043. The next prime is 78868093. The reversal of 78868079 is 97086887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78868079 - 2⁸ = 78867823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78868079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78862079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39434039 + 39434040.

It is an arithmetic number, because the mean of its divisors is an integer number (39434040).

Almost surely, 2^78868079 is an apocalyptic number.

78868079 is a deficient number, since it is larger than the sum of its proper divisors (1).

78868079 is an equidigital number, since it uses as much as digits as its factorization.

78868079 is an odious number, because the sum of its binary digits is odd.

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

The square root of 78868079 is about 8880.7701805643. The cubic root of 78868079 is about 428.8450691442.

The spelling of 78868079 in words is "seventy-eight million, eight hundred sixty-eight thousand, seventy-nine".