280288 has 24 divisors (see below), whose sum is σ = 582120. Its totient is φ = 132480.

The previous prime is 280277. The next prime is 280297. The reversal of 280288 is 882082.

It is a super-2 number, since 2×280288² = 157122725888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 378 + ... + 838.

It is an arithmetic number, because the mean of its divisors is an integer number (24255).

2²⁸⁰²⁸⁸ 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 280288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291060).

280288 is an abundant number, since it is smaller than the sum of its proper divisors (301832).

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

280288 is a wasteful number, since it uses less digits than its factorization.

280288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 280288 is about 529.4223266920. The cubic root of 280288 is about 65.4437486868.

The spelling of 280288 in words is "two hundred eighty thousand, two hundred eighty-eight".