78814979 has 2 divisors, whose sum is σ = 78814980. Its totient is φ = 78814978.

The previous prime is 78814937. The next prime is 78814991. The reversal of 78814979 is 97941887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78814979 - 2¹² = 78810883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78814979.

It is not a weakly prime, because it can be changed into another prime (78814919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39407489 + 39407490.

It is an arithmetic number, because the mean of its divisors is an integer number (39407490).

Almost surely, 2^78814979 is an apocalyptic number.

78814979 is a deficient number, since it is larger than the sum of its proper divisors (1).

78814979 is an equidigital number, since it uses as much as digits as its factorization.

78814979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 78814979 is about 8877.7800716170. The cubic root of 78814979 is about 428.7488038114.

The spelling of 78814979 in words is "seventy-eight million, eight hundred fourteen thousand, nine hundred seventy-nine".