Hex #409e80 or rgb(64,158,128) in RGB space is the tint of greenish cian. It has hue angle of 160.85 degrees, value = 62 and saturation = 59. #409e80 can be obtained by mixing 3 colors: 3 drops of blue, 3 drops of green, 2 drops of white.
Nearest safe hex - #339999. Below you can see the block with #409e80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #409e80 to the mixer and play with it.