268489781 has 8 divisors (see below), whose sum is σ = 309661440. Its totient is φ = 228022128.

The previous prime is 268489777. The next prime is 268489783. The reversal of 268489781 is 187984862.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 268489781 - 2² = 268489777 is a prime.

It is a super-2 number, since 2×268489781² = 144173525002855922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268489783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175181 + ... + 176706.

It is an arithmetic number, because the mean of its divisors is an integer number (38707680).

Almost surely, 2^268489781 is an apocalyptic number.

It is an amenable number.

268489781 is a deficient number, since it is larger than the sum of its proper divisors (41171659).

268489781 is a wasteful number, since it uses less digits than its factorization.

268489781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352003.

The product of its digits is 1548288, while the sum is 53.

The square root of 268489781 is about 16385.6577835618. The cubic root of 268489781 is about 645.1230909042.

The spelling of 268489781 in words is "two hundred sixty-eight million, four hundred eighty-nine thousand, seven hundred eighty-one".