Hex #305790 or rgb(48,87,144) in RGB space is the tint of blue. It has hue angle of 215.63 degrees, value = 56 and saturation = 67. #305790 can be obtained by mixing 4 colors: 3 drops of magenta, 3 drops of blue, 5 drops of cyan, 5 drops of black.
Nearest safe hex - #336699. Below you can see the block with #305790 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #305790 to the mixer and play with it.