78797969 has 2 divisors, whose sum is σ = 78797970. Its totient is φ = 78797968.

The previous prime is 78797947. The next prime is 78798029. The reversal of 78797969 is 96979787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 16703569 = 7880^2 + 4087^2 .

It is an emirp because it is prime and its reverse (96979787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78797969 - 2⁸ = 78797713 is a prime.

It is a super-2 number, since 2×78797969² = 12418239837049922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78797869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39398984 + 39398985.

It is an arithmetic number, because the mean of its divisors is an integer number (39398985).

Almost surely, 2^78797969 is an apocalyptic number.

It is an amenable number.

78797969 is a deficient number, since it is larger than the sum of its proper divisors (1).

78797969 is an equidigital number, since it uses as much as digits as its factorization.

78797969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256, while the sum is 62.

The square root of 78797969 is about 8876.8220101566. The cubic root of 78797969 is about 428.7179571290.

The spelling of 78797969 in words is "seventy-eight million, seven hundred ninety-seven thousand, nine hundred sixty-nine".