281536 has 28 divisors (see below), whose sum is σ = 576072. Its totient is φ = 136448.

The previous prime is 281531. The next prime is 281539. The reversal of 281536 is 635182.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 281536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281531) 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 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 3433.

It is an arithmetic number, because the mean of its divisors is an integer number (20574).

2²⁸¹⁵³⁶ 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 281536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288036).

281536 is an abundant number, since it is smaller than the sum of its proper divisors (294536).

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

281536 is an equidigital number, since it uses as much as digits as its factorization.

281536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 138 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 281536 is about 530.5996607613. The cubic root of 281536 is about 65.5407356884.

The spelling of 281536 in words is "two hundred eighty-one thousand, five hundred thirty-six".