281968 has 10 divisors (see below), whose sum is σ = 546344. Its totient is φ = 140976.

The previous prime is 281959. The next prime is 281971. The reversal of 281968 is 869182.

It is a congruent number.

It is an unprimeable number.

281968 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8796 + ... + 8827.

2²⁸¹⁹⁶⁸ is an apocalyptic number.

It is an amenable number.

281968 is a deficient number, since it is larger than the sum of its proper divisors (264376).

281968 is a wasteful number, since it uses less digits than its factorization.

281968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17631 (or 17625 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 281968 is about 531.0065912962. The cubic root of 281968 is about 65.5742413245.

The spelling of 281968 in words is "two hundred eighty-one thousand, nine hundred sixty-eight".