Hex #405664 or rgb(64,86,100) in RGB space is the tint of blue. It has hue angle of 203.33 degrees, value = 39 and saturation = 36. #405664 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 2 drops of white, 5 drops of black.
Nearest safe hex - #336666. Below you can see the block with #405664 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #405664 to the mixer and play with it.