Hex #778794 or rgb(119,135,148) in RGB space is the tint of blue. It has hue angle of 206.90 degrees, value = 58 and saturation = 20. #778794 can be obtained by mixing 4 colors: 3 drops of magenta, 4 drops of blue, 4 drops of green, 4 drops of white.
Nearest safe hex - #669999. Below you can see the block with #778794 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #778794 to the mixer and play with it.