Tuesday, October 9, 2012

Brainteaser for October 9, 2012

Brainteaser for October 9, 2012

Question:
The number six has factors(not including itself) of 1, 2, and 3, which add up to itself. The number 28 also has this property, as 1,2, 4, 7, and 14 add up to itself.

What four-digit number shares this property?

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