77256217 has 2 divisors, whose sum is σ = 77256218. Its totient is φ = 77256216.

The previous prime is 77256197. The next prime is 77256227. The reversal of 77256217 is 71265277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61921161 + 15335056 = 7869^2 + 3916^2 .

It is a cyclic number.

It is not a de Polignac number, because 77256217 - 2¹¹ = 77254169 is a prime.

It is not a weakly prime, because it can be changed into another prime (77256227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38628108 + 38628109.

It is an arithmetic number, because the mean of its divisors is an integer number (38628109).

Almost surely, 2^77256217 is an apocalyptic number.

It is an amenable number.

77256217 is a deficient number, since it is larger than the sum of its proper divisors (1).

77256217 is an equidigital number, since it uses as much as digits as its factorization.

77256217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41160, while the sum is 37.

The square root of 77256217 is about 8789.5515812810. The cubic root of 77256217 is about 425.9034382593.

The spelling of 77256217 in words is "seventy-seven million, two hundred fifty-six thousand, two hundred seventeen".