Talking about only whole numbers, there are
(9 x 9 x 8 x 7 x 6) = 27,216 possibilities.
24,681 is an example.
987654
256
98765432
9876543210, without using any mathemeatical operations.
It is 98765.
987654
86420
9876543210
873 is.
256
98765432
9876543210, without using any mathemeatical operations.
123,456,789
9876543
9876543
It is 98765.
id say, 0123456789. but depends how many digits you can have