Hex #55b840 or rgb(85,184,64) in RGB space is the tint of grass green. It has hue angle of 109.50 degrees, value = 72 and saturation = 65. #55b840 can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of cyan, 3 drops of green, 2 drops of black.
Nearest safe hex - #66cc33. Below you can see the block with #55b840 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55b840 to the mixer and play with it.