Let A = 1, B = 2, C = 3, ..., Z = 26. The product value of a word is equal to the product of the values of its letters. For example, CAB has a product value of 3\($\times$ 1 $\times$\) 2 = 6. What common English word has a product value of 715? It does not have to be of length 3.
Ummm, a lot of the questions you are asking is about prime factorization, so if you are asking people to do your hw for you, pls stop. Why don't you try to solve them yourself..... Anyway, this link might help.