Assuming you don't want a preceding zero, then:
~if~ you accept repeated use of the same digit (e.g. "111111"), then the answer is 5 * 65, or 38880
If digits can not be used repeatedly, then the answer is 5 * 5!, or 5 * 5 * 4 * 3 * 2 * 1, which equals 600.
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100,000
12
24
There are 504 such numbers.
823543