281568 has 48 divisors (see below), whose sum is σ = 846720. Its totient is φ = 80256.

The previous prime is 281563. The next prime is 281579. The reversal of 281568 is 865182.

281568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281563) by changing a digit.

281568 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 in 7 ways as a sum of consecutive naturals, for example, 463 + ... + 881.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2²⁸¹⁵⁶⁸ is an apocalyptic number.

281568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423360).

281568 is an abundant number, since it is smaller than the sum of its proper divisors (565152).

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

281568 is a wasteful number, since it uses less digits than its factorization.

281568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 431 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 281568 is about 530.6298144658. The cubic root of 281568 is about 65.5432187623.

It can be divided in two parts, 28 and 1568, that added together give a triangular number (1596 = T₅₆).

The spelling of 281568 in words is "two hundred eighty-one thousand, five hundred sixty-eight".