Hex #404840 or rgb(64,72,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 28 and saturation = 11. #404840 can be obtained by mixing 4 colors: 2 drops of red, 3 drops of blue, 2 drops of green, 1 drop of black.
Nearest safe hex - #333333. Below you can see the block with #404840 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #404840 to the mixer and play with it.