77255257 has 2 divisors, whose sum is σ = 77255258. Its totient is φ = 77255256.

The previous prime is 77255251. The next prime is 77255281. The reversal of 77255257 is 75255277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76807696 + 447561 = 8764^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 77255257 - 2²³ = 68866649 is a prime.

It is not a weakly prime, because it can be changed into another prime (77255251) 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, 38627628 + 38627629.

It is an arithmetic number, because the mean of its divisors is an integer number (38627629).

Almost surely, 2^77255257 is an apocalyptic number.

It is an amenable number.

77255257 is a deficient number, since it is larger than the sum of its proper divisors (1).

77255257 is an equidigital number, since it uses as much as digits as its factorization.

77255257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 171500, while the sum is 40.

The square root of 77255257 is about 8789.4969708169. The cubic root of 77255257 is about 425.9016741337.

The spelling of 77255257 in words is "seventy-seven million, two hundred fifty-five thousand, two hundred fifty-seven".