281920 has 28 divisors (see below), whose sum is σ = 672084. Its totient is φ = 112640.

The previous prime is 281893. The next prime is 281921. The reversal of 281920 is 29182.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 207936 = 272^2 + 456^2 .

It is a junction number, because it is equal to n+sod(n) for n = 281891 and 281900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281921) 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, 121 + ... + 760.

It is an arithmetic number, because the mean of its divisors is an integer number (24003).

2²⁸¹⁹²⁰ is an apocalyptic number.

281920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281920 is an abundant number, since it is smaller than the sum of its proper divisors (390164).

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

281920 is an equidigital number, since it uses as much as digits as its factorization.

281920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 281920 is about 530.9613921934. The cubic root of 281920 is about 65.5705201668.

The spelling of 281920 in words is "two hundred eighty-one thousand, nine hundred twenty".