Hex #789a9b or rgb(120,154,155) in RGB space is the tint of cyan. It has hue angle of 181.71 degrees, value = 61 and saturation = 23. #789a9b can be obtained by mixing 4 colors: 5 drops of magenta, 4 drops of cyan, 5 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #789a9b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #789a9b to the mixer and play with it.