Hex #407f00 or rgb(64,127,0) in RGB space is the tint of olive. It has hue angle of 89.76 degrees, value = 50 and saturation = 100. #407f00 can be obtained by mixing 3 colors: 2 drops of yellow, 3 drops of green, 3 drops of black.
Nearest safe hex - #336600. Below you can see the block with #407f00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #407f00 to the mixer and play with it.