Just 1.
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43 is prime so just 43 and 1
There are 3 prime numbers from 40 to 50:41, 43 and 47
Round each of the numbers then add the rounded numbers. 60+40=100.
These are all the whole numbers that go into 129 evenly: 1, 3, 43, 129.
All numbers that are bigger than zero and smaller than 50 can go into 50 at least one time. There are an infinite number of them.