268806689 has 2 divisors, whose sum is σ = 268806690. Its totient is φ = 268806688.

The previous prime is 268806647. The next prime is 268806709. The reversal of 268806689 is 986608862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225510289 + 43296400 = 15017^2 + 6580^2 .

It is a cyclic number.

It is not a de Polignac number, because 268806689 - 2²⁸ = 371233 is a prime.

It is a super-2 number, since 2×268806689² = 144514072102285442, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268806689.

It is not a weakly prime, because it can be changed into another prime (268806289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134403344 + 134403345.

It is an arithmetic number, because the mean of its divisors is an integer number (134403345).

Almost surely, 2^268806689 is an apocalyptic number.

It is an amenable number.

268806689 is a deficient number, since it is larger than the sum of its proper divisors (1).

268806689 is an equidigital number, since it uses as much as digits as its factorization.

268806689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The square root of 268806689 is about 16395.3252178784. The cubic root of 268806689 is about 645.3768116512.

The spelling of 268806689 in words is "two hundred sixty-eight million, eight hundred six thousand, six hundred eighty-nine".