Hummer scored nine points during a 17-5 run for the Tigers (11-7, 4-0) at the end of the first half that produced a 29-17 halftime advantage.
Princeton, which shot 54.8 percent (23 of 42) and made 8 of 13 from 3-point range, never led by fewer than 12 in the second half.
Koon and T.J. Bray, who finished with 14 points, each made 6 of 7 shots for Princeton, and Hummer was 6 of 10.
Hummer now has 1,455 career points, good for fourth on Princeton's all-time list. He passed Craig Robinson, the brother-in-law of President Obama, who had been fifth, and Pete Campbell.
Rafael Maia scored 19 points for the Bears (8-11, 2-3), who shot 38 percent (19 of 50), including 1 of 12 on 3-pointers.
ESPN's Dan Dakich joins The Paul Finebaum Show to discuss the SEC's presence in the NBA Draft.
Ted Kapita was the top-rated recruit from West Virginia in the class of 2015 and recently played at DME Academy in Florida.
With the Suns drafting Tyler Ulis, they now have five guards on their roster who attended Kentucky.