Hex #508520 or rgb(80,133,32) in RGB space is the tint of olive. It has hue angle of 91.49 degrees, value = 52 and saturation = 76. #508520 can be obtained by mixing 4 colors: 5 drops of yellow, 3 drops of blue, 4 drops of green, 4 drops of black.
Nearest safe hex - #669933. Below you can see the block with #508520 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #508520 to the mixer and play with it.