77996717 has 2 divisors, whose sum is σ = 77996718. Its totient is φ = 77996716.

The previous prime is 77996671. The next prime is 77996771. The reversal of 77996717 is 71769977.

Together with next prime (77996771) 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., 62425801 + 15570916 = 7901^2 + 3946^2 .

It is a cyclic number.

It is not a de Polignac number, because 77996717 - 2⁸ = 77996461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77996117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38998358 + 38998359.

It is an arithmetic number, because the mean of its divisors is an integer number (38998359).

Almost surely, 2^77996717 is an apocalyptic number.

It is an amenable number.

77996717 is a deficient number, since it is larger than the sum of its proper divisors (1).

77996717 is an equidigital number, since it uses as much as digits as its factorization.

77996717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166886, while the sum is 53.

The square root of 77996717 is about 8831.5750010969. The cubic root of 77996717 is about 427.2598735821.

The spelling of 77996717 in words is "seventy-seven million, nine hundred ninety-six thousand, seven hundred seventeen".