77727317 has 2 divisors, whose sum is σ = 77727318. Its totient is φ = 77727316.

The previous prime is 77727313. The next prime is 77727371. The reversal of 77727317 is 71372777.

Together with next prime (77727371) 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., 76755121 + 972196 = 8761^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 77727317 - 2² = 77727313 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77727313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38863658 + 38863659.

It is an arithmetic number, because the mean of its divisors is an integer number (38863659).

Almost surely, 2^77727317 is an apocalyptic number.

It is an amenable number.

77727317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77727317 is an equidigital number, since it uses as much as digits as its factorization.

77727317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100842, while the sum is 41.

The square root of 77727317 is about 8816.3097155216. The cubic root of 77727317 is about 426.7673888050.

The spelling of 77727317 in words is "seventy-seven million, seven hundred twenty-seven thousand, three hundred seventeen".