99,999,999
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8
To find that, simply take your largest 8-digit number: 99999999 And subtract your largest 7-digit number: 9999999 That leaves you with 90000000, or ninety-million.
That all depends upon what the first digit is. For example: First digit is 1. Answer is: 8 First digit is 2. Answer is 16. First digit is 3. Answer is 24.
57
8 digits