268988891 has 12 divisors (see below), whose sum is σ = 287766720. Its totient is φ = 250876080.

The previous prime is 268988873. The next prime is 268988893. The reversal of 268988891 is 198889862.

It is not a de Polignac number, because 268988891 - 2⁶ = 268988827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 268988891.

It is not an unprimeable number, because it can be changed into a prime (268988893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 491480 + ... + 492026.

It is an arithmetic number, because the mean of its divisors is an integer number (23980560).

Almost surely, 2^268988891 is an apocalyptic number.

268988891 is a deficient number, since it is larger than the sum of its proper divisors (18777829).

268988891 is an frugal number, since it uses more digits than its factorization.

With its predecessor (268988890) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (607).

268988891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 607 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 59.

The square root of 268988891 is about 16400.8807995181. The cubic root of 268988891 is about 645.5225947148.

The spelling of 268988891 in words is "two hundred sixty-eight million, nine hundred eighty-eight thousand, eight hundred ninety-one".