281220 has 48 divisors (see below), whose sum is σ = 813120. Its totient is φ = 72576.

The previous prime is 281207. The next prime is 281227. The reversal of 281220 is 22182.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 281220.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281220.

It is not an unprimeable number, because it can be changed into a prime (281227) by changing a digit.

281220 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 15 ways as a sum of consecutive naturals, for example, 2526 + ... + 2634.

It is an arithmetic number, because the mean of its divisors is an integer number (16940).

2²⁸¹²²⁰ is an apocalyptic number.

281220 is a gapful number since it is divisible by the number (20) 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 281220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406560).

281220 is an abundant number, since it is smaller than the sum of its proper divisors (531900).

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

281220 is a wasteful number, since it uses less digits than its factorization.

281220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 281220 is about 530.3018008644. The cubic root of 281220 is about 65.5162052245.

The spelling of 281220 in words is "two hundred eighty-one thousand, two hundred twenty".