281928 has 32 divisors (see below), whose sum is σ = 747360. Its totient is φ = 88320.

The previous prime is 281927. The next prime is 281933. The reversal of 281928 is 829182.

It is a junction number, because it is equal to n+sod(n) for n = 281895 and 281904.

It is not an unprimeable number, because it can be changed into a prime (281921) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (23355).

2²⁸¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373680).

281928 is an abundant number, since it is smaller than the sum of its proper divisors (465432).

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

281928 is a wasteful number, since it uses less digits than its factorization.

281928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 713 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 281928 is about 530.9689256444. The cubic root of 281928 is about 65.5711403890.

The spelling of 281928 in words is "two hundred eighty-one thousand, nine hundred twenty-eight".