281868 has 24 divisors (see below), whose sum is σ = 667968. Its totient is φ = 92496.

The previous prime is 281867. The next prime is 281887. The reversal of 281868 is 868182.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (281867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (27832).

2²⁸¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

281868 is an abundant number, since it is smaller than the sum of its proper divisors (386100).

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

281868 is a wasteful number, since it uses less digits than its factorization.

281868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 371 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 281868 is about 530.9124221564. The cubic root of 281868 is about 65.5664884359.

The spelling of 281868 in words is "two hundred eighty-one thousand, eight hundred sixty-eight".