78816299 has 2 divisors, whose sum is σ = 78816300. Its totient is φ = 78816298.

The previous prime is 78816289. The next prime is 78816323. The reversal of 78816299 is 99261887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78816299 - 2¹² = 78812203 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78816289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39408149 + 39408150.

It is an arithmetic number, because the mean of its divisors is an integer number (39408150).

Almost surely, 2^78816299 is an apocalyptic number.

78816299 is a deficient number, since it is larger than the sum of its proper divisors (1).

78816299 is an equidigital number, since it uses as much as digits as its factorization.

78816299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 78816299 is about 8877.8544142152. The cubic root of 78816299 is about 428.7511973719.

The spelling of 78816299 in words is "seventy-eight million, eight hundred sixteen thousand, two hundred ninety-nine".