Hex #808140 or rgb(128,129,64) in RGB space is the tint of yellow. It has hue angle of 60.92 degrees, value = 51 and saturation = 50. #808140 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of cyan, 3 drops of green, 1 drop of white.
Nearest safe hex - #999933. Below you can see the block with #808140 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #808140 to the mixer and play with it.