Let p(n) denote the product of the nonzero digits of n. For example, p(5) = 5, p(37) = 21, and p(604) = 24. Without resorting to a computer, evaluate p(1) + p(2) + p(3) + ... + p(999999).

The required expression adds up to 9,474,296,895

Posted by K Sengupta on 2022-06-08 00:06:47