Hex #005680 or rgb(0,86,128) in RGB space is the tint of bluish cian. It has hue angle of 199.69 degrees, value = 50 and saturation = 100. #005680 can be obtained by mixing 3 colors: 3 drops of blue, 2 drops of cyan, 3 drops of black.
Nearest safe hex - #006699. Below you can see the block with #005680 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005680 to the mixer and play with it.