There is no such number with "most factors"; if you have a number with a certain number of factors, you can always multiply it by 2, or by 3, etc., to get another number that has even more factors.
28
28
28
840
84 has 12 factors.
28
25
28
30
the number is 350 the factors is 175 and 2
the answer is 25, the factors are 1,5,25
25