Hex #507475 or rgb(80,116,117) in RGB space is the tint of cyan. It has hue angle of 181.62 degrees, value = 46 and saturation = 32. #507475 can be obtained by mixing 4 colors: 5 drops of magenta, 4 drops of cyan, 5 drops of green, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #507475 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #507475 to the mixer and play with it.