78896309 has 2 divisors, whose sum is σ = 78896310. Its totient is φ = 78896308.

The previous prime is 78896297. The next prime is 78896351. The reversal of 78896309 is 90369887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71487025 + 7409284 = 8455^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 78896309 - 2²⁴ = 62119093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78896359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39448154 + 39448155.

It is an arithmetic number, because the mean of its divisors is an integer number (39448155).

Almost surely, 2^78896309 is an apocalyptic number.

It is an amenable number.

78896309 is a deficient number, since it is larger than the sum of its proper divisors (1).

78896309 is an equidigital number, since it uses as much as digits as its factorization.

78896309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78896309 is about 8882.3594275395. The cubic root of 78896309 is about 428.8962299024.

The spelling of 78896309 in words is "seventy-eight million, eight hundred ninety-six thousand, three hundred nine".