It is probably a packed RGB value.
If so, 16777215 will be White as well.
Do you know hex numbers?
The 6 diget hex number will probably be formatted like this:
RRGGBB
Each "channel" or component goes from 00 to FF (0 to 255 in decimal).
If Red, Green and Blue are from 0 to 255 each:
ColourNum = Red * 2^16 + Green * 2^8 + Blue
should display the RGB colour combination. (2^16 is "two to the power of 16", or 2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2.)
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