128775769 has 2 divisors, whose sum is σ = 128775770. Its totient is φ = 128775768.

The previous prime is 128775763. The next prime is 128775839. The reversal of 128775769 is 967577821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100260169 + 28515600 = 10013^2 + 5340^2 .

It is a cyclic number.

It is not a de Polignac number, because 128775769 - 2¹³ = 128767577 is a prime.

It is a super-2 number, since 2×128775769² = 33166397363082722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128775763) 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, 64387884 + 64387885.

It is an arithmetic number, because the mean of its divisors is an integer number (64387885).

Almost surely, 2^128775769 is an apocalyptic number.

It is an amenable number.

128775769 is a deficient number, since it is larger than the sum of its proper divisors (1).

128775769 is an equidigital number, since it uses as much as digits as its factorization.

128775769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 52.

The square root of 128775769 is about 11347.9411789099. The cubic root of 128775769 is about 504.9845030045.

The spelling of 128775769 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, seven hundred sixty-nine".