Hex #55881d or rgb(85,136,29) in RGB space is the tint of olive. It has hue angle of 88.60 degrees, value = 53 and saturation = 79. #55881d can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of blue, 3 drops of green, 3 drops of black.
Nearest safe hex - #669933. Below you can see the block with #55881d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55881d to the mixer and play with it.