The answer is 8
You work out all the factors for both 600 and 128 and they are :
600 -1,600,2,300,3,200,4,150,5,120,6,100,8,75,10,60,12,50,15,40,20,30,24 and 25
128-1,128,2,64,4,32,8 and 16
And you see what is the highest common factor which is 8
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