Hex #77b561 or rgb(119,181,97) in RGB space is the tint of grass green. It has hue angle of 104.29 degrees, value = 71 and saturation = 46. #77b561 can be obtained by mixing 4 colors: 4 drops of yellow, 4 drops of blue, 4 drops of green, 3 drops of white.
Nearest safe hex - #66cc66. Below you can see the block with #77b561 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #77b561 to the mixer and play with it.