try to find two numbers that multiply to get that number. if you cant try to get something close to the same. then if one is an even number just divide it by 2 and multiply the other number by 2. keep doing this until you cant divide the number anymore. that should get you most of the factors
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128 = 27. You can find out this sort of things quickly if you take the trouble to divide the number into prime factors.
You can quickly find the factors for even numbers 50 to 100 by dividing each number by all possible factors (starting from 2) until reaching the square root of the number. If a number is divisible without a remainder, then it is a factor of that even number. Repeat this process for each even number between 50 and 100.
find all factors of 61
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List the factors. Cross out the even ones.