8,999,999 of them.
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There are exactly 9 million seven-digit numbers.
The first is 1,000,000 and the last is 9,999,999 -- counting them both and all the ones in between makes 9,000,000.
9999999 - 1000000 = 8999999 + 1 = 9000000
7 two-digit numbers.
-5
-3
There are 282 such numbers.
13