268890287 has 2 divisors, whose sum is σ = 268890288. Its totient is φ = 268890286.

The previous prime is 268890269. The next prime is 268890361. The reversal of 268890287 is 782098862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 268890287 - 2¹⁴ = 268873903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268890227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134445143 + 134445144.

It is an arithmetic number, because the mean of its divisors is an integer number (134445144).

Almost surely, 2^268890287 is an apocalyptic number.

268890287 is a deficient number, since it is larger than the sum of its proper divisors (1).

268890287 is an equidigital number, since it uses as much as digits as its factorization.

268890287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 268890287 is about 16397.8744659178. The cubic root of 268890287 is about 645.4437080752.

The spelling of 268890287 in words is "two hundred sixty-eight million, eight hundred ninety thousand, two hundred eighty-seven".