Hex #555240 or rgb(85,82,64) in RGB space is the tint of khaki. It has hue angle of 51.43 degrees, value = 33 and saturation = 25. #555240 can be obtained by mixing 4 colors: 3 drops of magenta, 4 drops of green, 1 drop of white, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #555240 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555240 to the mixer and play with it.