Hex #6d8780 or rgb(109,135,128) in RGB space is the tint of greenish cian. It has hue angle of 163.85 degrees, value = 53 and saturation = 19. #6d8780 can be obtained by mixing 4 colors: 3 drops of magenta, 3 drops of blue, 5 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #6d8780 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #6d8780 to the mixer and play with it.