There are a handful of six digit numbers that have no numbers repeating. Some examples are 123456, 234567, 345678, 456789, 567012, 654321, 765432, 876543, and 987654.
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823543
720 (10*9*8)
625 if numbers can have leading 0s, 500 otherwise.
81
9x9x8x7x6x5 = 81x56x30 = 136080