281648 has 20 divisors (see below), whose sum is σ = 565440. Its totient is φ = 135744.

The previous prime is 281647. The next prime is 281651. The reversal of 281648 is 846182.

281648 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 281648.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281648.

It is not an unprimeable number, because it can be changed into a prime (281641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (28272).

2²⁸¹⁶⁴⁸ 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 281648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282720).

281648 is an abundant number, since it is smaller than the sum of its proper divisors (283792).

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

281648 is a wasteful number, since it uses less digits than its factorization.

281648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 281648 is about 530.7051912314. The cubic root of 281648 is about 65.5494256241.

It can be divided in two parts, 281 and 648, that added together give a palindrome (929).

The spelling of 281648 in words is "two hundred eighty-one thousand, six hundred forty-eight".