256712289 has 8 divisors (see below), whose sum is σ = 344746080. Its totient is φ = 169910016.

The previous prime is 256712273. The next prime is 256712293. The reversal of 256712289 is 982217652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256712289 - 2⁴ = 256712273 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256712289.

It is not an unprimeable number, because it can be changed into a prime (256712219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307392 + ... + 308225.

It is an arithmetic number, because the mean of its divisors is an integer number (43093260).

Almost surely, 2^256712289 is an apocalyptic number.

It is an amenable number.

256712289 is a deficient number, since it is larger than the sum of its proper divisors (88033791).

256712289 is a wasteful number, since it uses less digits than its factorization.

256712289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615759.

The product of its digits is 120960, while the sum is 42.

The square root of 256712289 is about 16022.2435694880. The cubic root of 256712289 is about 635.5487756092.

The spelling of 256712289 in words is "two hundred fifty-six million, seven hundred twelve thousand, two hundred eighty-nine".