Hex #405a80 or rgb(64,90,128) in RGB space is the tint of blue. It has hue angle of 215.63 degrees, value = 50 and saturation = 50. #405a80 can be obtained by mixing 3 colors: 3 drops of blue, 2 drops of white, 3 drops of black.
Nearest safe hex - #336699. Below you can see the block with #405a80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #405a80 to the mixer and play with it.