281668 has 12 divisors (see below), whose sum is σ = 500752. Its totient is φ = 138600.

The previous prime is 281663. The next prime is 281669. The reversal of 281668 is 866182.

281668 is nontrivially palindromic in base 16.

It is not an unprimeable number, because it can be changed into a prime (281663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258 + ... + 793.

2²⁸¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

281668 is a deficient number, since it is larger than the sum of its proper divisors (219084).

281668 is a wasteful number, since it uses less digits than its factorization.

281668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 281668 is about 530.7240337501. The cubic root of 281668 is about 65.5509771559.

It can be divided in two parts, 281 and 668, that added together give a palindrome (949).

The spelling of 281668 in words is "two hundred eighty-one thousand, six hundred sixty-eight".