268889138 has 16 divisors (see below), whose sum is σ = 473411904. Its totient is φ = 112123440.

The previous prime is 268889123. The next prime is 268889147. The reversal of 268889138 is 831988862.

It is a self number, because there is not a number n which added to its sum of digits gives 268889138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259028 + ... + 260063.

It is an arithmetic number, because the mean of its divisors is an integer number (29588244).

Almost surely, 2^268889138 is an apocalyptic number.

268889138 is a deficient number, since it is larger than the sum of its proper divisors (204522766).

268889138 is a wasteful number, since it uses less digits than its factorization.

268889138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519137.

The product of its digits is 1327104, while the sum is 53.

The square root of 268889138 is about 16397.8394308519. The cubic root of 268889138 is about 645.4427887214.

The spelling of 268889138 in words is "two hundred sixty-eight million, eight hundred eighty-nine thousand, one hundred thirty-eight".