724 x 4 = 2896
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exactly 181
It's 4
77....724 where the 7 is repeated as many times as you like, making the number [possibly] infinite. However, I suspect the question requires a three digit number consisting of the digits of the set {2, 4, 7} used once each: 724
724
The divisibility rule for 3 is add up the digits and check for divisibility. 7+2+4 = 13.13 is not evenly divisible by 3 so 724 is not divisibleby 3.