281428 has 36 divisors (see below), whose sum is σ = 619360. Its totient is φ = 109296.

The previous prime is 281423. The next prime is 281429. The reversal of 281428 is 824182.

281428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281423) by changing a digit.

281428 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 11 ways as a sum of consecutive naturals, for example, 12225 + ... + 12247.

2²⁸¹⁴²⁸ is an apocalyptic number.

281428 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 281428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309680).

281428 is an abundant number, since it is smaller than the sum of its proper divisors (337932).

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

281428 is a wasteful number, since it uses less digits than its factorization.

281428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 51 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 281428 is about 530.4978793549. The cubic root of 281428 is about 65.5323539246.

The spelling of 281428 in words is "two hundred eighty-one thousand, four hundred twenty-eight".