78695317 has 2 divisors, whose sum is σ = 78695318. Its totient is φ = 78695316.

The previous prime is 78695303. The next prime is 78695333. The reversal of 78695317 is 71359687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78694641 + 676 = 8871^2 + 26^2 .

It is a cyclic number.

It is not a de Polignac number, because 78695317 - 2¹⁹ = 78171029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78695717) 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, 39347658 + 39347659.

It is an arithmetic number, because the mean of its divisors is an integer number (39347659).

Almost surely, 2^78695317 is an apocalyptic number.

It is an amenable number.

78695317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78695317 is an equidigital number, since it uses as much as digits as its factorization.

78695317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 78695317 is about 8871.0381015978. The cubic root of 78695317 is about 428.5317091814.

The spelling of 78695317 in words is "seventy-eight million, six hundred ninety-five thousand, three hundred seventeen".