Hex #5b8ca4 or rgb(91,140,164) in RGB space is the tint of bluish cian. It has hue angle of 199.73 degrees, value = 64 and saturation = 45. #5b8ca4 can be obtained by mixing 4 colors: 3 drops of blue, 2 drops of cyan, 5 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b8ca4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b8ca4 to the mixer and play with it.