78782317 has 2 divisors, whose sum is σ = 78782318. Its totient is φ = 78782316.

The previous prime is 78782311. The next prime is 78782329. The reversal of 78782317 is 71328787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76282756 + 2499561 = 8734^2 + 1581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78782317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78782311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39391158 + 39391159.

It is an arithmetic number, because the mean of its divisors is an integer number (39391159).

Almost surely, 2^78782317 is an apocalyptic number.

It is an amenable number.

78782317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78782317 is an equidigital number, since it uses as much as digits as its factorization.

78782317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 43.

The square root of 78782317 is about 8875.9403445494. The cubic root of 78782317 is about 428.6895691815.

The spelling of 78782317 in words is "seventy-eight million, seven hundred eighty-two thousand, three hundred seventeen".