John Abraham is a closet mathematician. He remembers numbers at the tip of his tongue -- birthdays, anniversaries, mobile numbers, car number plates.

The actor's love for calculations started during his early corporate days. Reveals a source, "Give John a problem to solve and he's done with it in seconds -- he's always up for a mathematical challenge and remembers dates and numbers on the back of his hand."

Knowing that he's back to being single, remembering phone numbers of hot girls should be easy for him, too!