How many of the factors of 280 are divisible by 2?  Choose the correct choice from the following:
A) 4
B) 8
C) 10
D) 12
E) 16
280 = 2^3*5*7   The total number of factors is (1+3)(1+1)(1+1) = 16   The odd factors are 1, 5, 7, and 35.   The number of even factors is 16-4= 
<gadget id="calculator">16-4</gadget>
<output>12</output>
12   The answer is 12.
<result>D</result>
How many of the factors of 280 are divisible by 2?