78617713 has 2 divisors, whose sum is σ = 78617714. Its totient is φ = 78617712.

The previous prime is 78617659. The next prime is 78617729. The reversal of 78617713 is 31771687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55845729 + 22771984 = 7473^2 + 4772^2 .

It is an emirp because it is prime and its reverse (31771687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78617713 is a prime.

It is not a weakly prime, because it can be changed into another prime (78617743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39308856 + 39308857.

It is an arithmetic number, because the mean of its divisors is an integer number (39308857).

Almost surely, 2^78617713 is an apocalyptic number.

It is an amenable number.

78617713 is a deficient number, since it is larger than the sum of its proper divisors (1).

78617713 is an equidigital number, since it uses as much as digits as its factorization.

78617713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 40.

The square root of 78617713 is about 8866.6630137837. The cubic root of 78617713 is about 428.3907998552.

The spelling of 78617713 in words is "seventy-eight million, six hundred seventeen thousand, seven hundred thirteen".