I'd fold. With six callers I'd bet a pair of 7s or 2s on the flop is not a staying hand. That means you can only hope for two pair or a matching pair on the flop to make three of a kind. Probability of flopping two pair is about 2%, of flopping three of a kind is 1.3%. So you end up with a playable hand 3.3% of the time. This gives you odds of approximately 32:1. You need 32X40 to make the call, or 1280 in the pot to stay. Thats 16 callers, which ain't gonna happen.

Of course, it could happen that you flop a straight draw, say 568. I'm not exactly of the probability of that occurring, but I think its clsoe to 1.3% (same as a straight hitting for suited connector). That would give you cumulative odds of 4.6% or about 19:1 odds of having something to play.