255840769 has 4 divisors (see below), whose sum is σ = 270890244. Its totient is φ = 240791296.

The previous prime is 255840743. The next prime is 255840797. The reversal of 255840769 is 967048552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72590400 + 183250369 = 8520^2 + 13537^2 .

It is a cyclic number.

It is not a de Polignac number, because 255840769 - 2⁹ = 255840257 is a prime.

It is a super-2 number, since 2×255840769² = 130908998165022722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255840269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7524712 + ... + 7524745.

It is an arithmetic number, because the mean of its divisors is an integer number (67722561).

Almost surely, 2^255840769 is an apocalyptic number.

It is an amenable number.

255840769 is a deficient number, since it is larger than the sum of its proper divisors (15049475).

255840769 is a wasteful number, since it uses less digits than its factorization.

255840769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15049474.

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 255840769 is about 15995.0232572510. The cubic root of 255840769 is about 634.8287458493.

The spelling of 255840769 in words is "two hundred fifty-five million, eight hundred forty thousand, seven hundred sixty-nine".