78460717 has 2 divisors, whose sum is σ = 78460718. Its totient is φ = 78460716.

The previous prime is 78460703. The next prime is 78460771. The reversal of 78460717 is 71706487.

Together with next prime (78460771) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53670276 + 24790441 = 7326^2 + 4979^2 .

It is an emirp because it is prime and its reverse (71706487) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78460717 is a prime.

It is a super-2 number, since 2×78460717² = 12312168224308178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78460717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78460777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39230358 + 39230359.

It is an arithmetic number, because the mean of its divisors is an integer number (39230359).

Almost surely, 2^78460717 is an apocalyptic number.

It is an amenable number.

78460717 is a deficient number, since it is larger than the sum of its proper divisors (1).

78460717 is an equidigital number, since it uses as much as digits as its factorization.

78460717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 78460717 is about 8857.8054279827. The cubic root of 78460717 is about 428.1054508416.

The spelling of 78460717 in words is "seventy-eight million, four hundred sixty thousand, seven hundred seventeen".