For number 2450 ,Find the sum and number of factors not divisible by 75?

• the standard form of 2450 = 2^1 * 5^2 * 7^2
  
  the standard form of 75= 3^1 * 5^2
  
  so we can see that there is no term of 3 in our standard form of 2450 so we are safe no need to do anything simply find the sum of all factor and we will get our answer.
  
  for the Sum of all factors of 2450 = (2^0+2^1) (5^0+5^1+5^2) (7^0+7^1+7^2)
  
  
  
  
  we do not want any multiple of 75 so we will not select 5^2 from the bracket of (5^0+5^1+5^2)
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