Hex #5d90aa or rgb(93,144,170) in RGB space is the tint of bluish cian. It has hue angle of 200.26 degrees, value = 67 and saturation = 45. #5d90aa can be obtained by mixing 4 colors: 3 drops of red, 2 drops of blue, 5 drops of cyan, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #5d90aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5d90aa to the mixer and play with it.