77780317 has 2 divisors, whose sum is σ = 77780318. Its totient is φ = 77780316.

The previous prime is 77780303. The next prime is 77780341. The reversal of 77780317 is 71308777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67469796 + 10310521 = 8214^2 + 3211^2 .

It is an emirp because it is prime and its reverse (71308777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77780317 - 2⁷ = 77780189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77780317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77780377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38890158 + 38890159.

It is an arithmetic number, because the mean of its divisors is an integer number (38890159).

Almost surely, 2^77780317 is an apocalyptic number.

It is an amenable number.

77780317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77780317 is an equidigital number, since it uses as much as digits as its factorization.

77780317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57624, while the sum is 40.

The square root of 77780317 is about 8819.3149960754. The cubic root of 77780317 is about 426.8643668621.

The spelling of 77780317 in words is "seventy-seven million, seven hundred eighty thousand, three hundred seventeen".