280228 has 24 divisors (see below), whose sum is σ = 560952. Its totient is φ = 121344.

The previous prime is 280223. The next prime is 280229. The reversal of 280228 is 822082.

It can be written as a sum of positive squares in 4 ways, for example, as 1444 + 278784 = 38^2 + 528^2 .

It is a junction number, because it is equal to n+sod(n) for n = 280199 and 280208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280223) 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, 726 + ... + 1042.

It is an arithmetic number, because the mean of its divisors is an integer number (23373).

2²⁸⁰²²⁸ is an apocalyptic number.

It is an amenable number.

280228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

280228 is a wasteful number, since it uses less digits than its factorization.

280228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 280228 is about 529.3656581230. The cubic root of 280228 is about 65.4390786032.

The spelling of 280228 in words is "two hundred eighty thousand, two hundred twenty-eight".