The digit indicate the facing direction of the runway. A single digit could be confusing.
Ex: does 1 mean 01 or 10? Is 7 07 or 70. 07 is NNE and 70 is ENE.
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Airport runways are.
9/27: 2813m 10/28: 3810m 11/29: 4430m
Runways, sort of (they're actually that divided by 10, zero-padded to two digits if necessary). So a runway marked "27" has a heading of approximately 270 degrees and therefore runs due west (Runways have different numbers on each end; the other end of runway 27 would be marked "09").
The largest digits number with only 2 digits alike is 99
10 digits