78682717 has 2 divisors, whose sum is σ = 78682718. Its totient is φ = 78682716.

The previous prime is 78682679. The next prime is 78682729. The reversal of 78682717 is 71728687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76230361 + 2452356 = 8731^2 + 1566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78682717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78682777) 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, 39341358 + 39341359.

It is an arithmetic number, because the mean of its divisors is an integer number (39341359).

Almost surely, 2^78682717 is an apocalyptic number.

It is an amenable number.

78682717 is a deficient number, since it is larger than the sum of its proper divisors (1).

78682717 is an equidigital number, since it uses as much as digits as its factorization.

78682717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 46.

The square root of 78682717 is about 8870.3278969833. The cubic root of 78682717 is about 428.5088370549.

It can be divided in two parts, 7868 and 2717, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 78682717 in words is "seventy-eight million, six hundred eighty-two thousand, seven hundred seventeen".