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"Permutations" do consider the order. If you want the order ignored, then you're looking for "combinations". 3-digit permutations, repetition allowed: 9 x 9 x 9 = 729 3-digit permutations, no repetition: 9 x 8 x 7 = 504 3-digit combinations, no repetition = 504/6 = 84.
10 x 9 x 8 = 720 different "permutations"
The first digit can be any one of 8. (all except '0' and '5')The second, third, fourth, fifth, and sixth digit can be any one of 9. (all except '5')The total number of possible permutations is (8 x 9 x 9 x 9 x 9 x 9) = 472,392
8 digits
10,000,000 is the smallest 8 digit number 99,999,999 is the largest 8 digit number