The answer depends on the extent to which the number is to be rounded. To the nearest tenths it is 5.0 while to the nearest tens it is 0.
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500
500
5.0
Well, let's take a look at our number 498. When we round it to the nearest hundred, we see that it's closer to 500 than 400. So, 498 rounded to the nearest hundred is 500. Just a little nudge up the happy little number line!
The short answer is, infinite. With just integers, There are 498 numbers that can round up to 500, and 498 that can round down. If we include partial numbers, there are infinite, since the numbers can get infinitesimally small.