78609599 has 2 divisors, whose sum is σ = 78609600. Its totient is φ = 78609598.

The previous prime is 78609551. The next prime is 78609611. The reversal of 78609599 is 99590687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78609599 - 2²⁰ = 77561023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78609599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78602599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304799 + 39304800.

It is an arithmetic number, because the mean of its divisors is an integer number (39304800).

Almost surely, 2^78609599 is an apocalyptic number.

78609599 is a deficient number, since it is larger than the sum of its proper divisors (1).

78609599 is an equidigital number, since it uses as much as digits as its factorization.

78609599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 78609599 is about 8866.2054453977. The cubic root of 78609599 is about 428.3760615203.

The spelling of 78609599 in words is "seventy-eight million, six hundred nine thousand, five hundred ninety-nine".