774728861 has 2 divisors, whose sum is σ = 774728862. Its totient is φ = 774728860.

The previous prime is 774728837. The next prime is 774728869. The reversal of 774728861 is 168827477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774508900 + 219961 = 27830^2 + 469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-774728861 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 (774728869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387364430 + 387364431.

It is an arithmetic number, because the mean of its divisors is an integer number (387364431).

Almost surely, 2^774728861 is an apocalyptic number.

It is an amenable number.

774728861 is a deficient number, since it is larger than the sum of its proper divisors (1).

774728861 is an equidigital number, since it uses as much as digits as its factorization.

774728861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 50.

The square root of 774728861 is about 27833.9515879438. The cubic root of 774728861 is about 918.4381427502.

The spelling of 774728861 in words is "seven hundred seventy-four million, seven hundred twenty-eight thousand, eight hundred sixty-one".