281764 has 24 divisors (see below), whose sum is σ = 584640. Its totient is φ = 116256.

The previous prime is 281761. The next prime is 281767. The reversal of 281764 is 467182.

It is an interprime number because it is at equal distance from previous prime (281761) and next prime (281767).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (281761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639 + ... + 985.

It is an arithmetic number, because the mean of its divisors is an integer number (24360).

2²⁸¹⁷⁶⁴ 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 281764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292320).

281764 is an abundant number, since it is smaller than the sum of its proper divisors (302876).

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

281764 is a wasteful number, since it uses less digits than its factorization.

281764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 281764 is about 530.8144685293. The cubic root of 281764 is about 65.5584234863.

The spelling of 281764 in words is "two hundred eighty-one thousand, seven hundred sixty-four".