281320 has 32 divisors (see below), whose sum is σ = 682920. Its totient is φ = 103680.

The previous prime is 281317. The next prime is 281321. The reversal of 281320 is 23182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 119716 = 402^2 + 346^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 281294 and 281303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250 + ... + 790.

2²⁸¹³²⁰ is an apocalyptic number.

281320 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 281320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341460).

281320 is an abundant number, since it is smaller than the sum of its proper divisors (401600).

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

281320 is a wasteful number, since it uses less digits than its factorization.

281320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 281320 is about 530.3960784169. The cubic root of 281320 is about 65.5239700161.

The spelling of 281320 in words is "two hundred eighty-one thousand, three hundred twenty".