268799989 has 2 divisors, whose sum is σ = 268799990. Its totient is φ = 268799988.

The previous prime is 268799987. The next prime is 268800031. The reversal of 268799989 is 989997862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208224900 + 60575089 = 14430^2 + 7783^2 .

It is a cyclic number.

It is not a de Polignac number, because 268799989 - 2¹ = 268799987 is a prime.

Together with 268799987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268799981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134399994 + 134399995.

It is an arithmetic number, because the mean of its divisors is an integer number (134399995).

Almost surely, 2^268799989 is an apocalyptic number.

It is an amenable number.

268799989 is a deficient number, since it is larger than the sum of its proper divisors (1).

268799989 is an equidigital number, since it uses as much as digits as its factorization.

268799989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 67.

The square root of 268799989 is about 16395.1208900697. The cubic root of 268799989 is about 645.3714496064.

The spelling of 268799989 in words is "two hundred sixty-eight million, seven hundred ninety-nine thousand, nine hundred eighty-nine".