268991886 has 16 divisors (see below), whose sum is σ = 543311568. Its totient is φ = 88776000.

The previous prime is 268991869. The next prime is 268991893. The reversal of 268991886 is 688199862.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221335 + ... + 222546.

It is an arithmetic number, because the mean of its divisors is an integer number (33956973).

Almost surely, 2^268991886 is an apocalyptic number.

268991886 is an abundant number, since it is smaller than the sum of its proper divisors (274319682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

268991886 is a wasteful number, since it uses less digits than its factorization.

268991886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443987.

The product of its digits is 2985984, while the sum is 57.

The square root of 268991886 is about 16400.9721053357. The cubic root of 268991886 is about 645.5249905176.

The spelling of 268991886 in words is "two hundred sixty-eight million, nine hundred ninety-one thousand, eight hundred eighty-six".