778

Number
$778$ (seven hundred and seventy-eight) is:
 * $2 \times 389$


 * The $40$th Smith number after $4$, $22$, $27$, $58$, $\ldots$, $648$, $654$, $663$, $666$, $690$, $706$, $728$, $729$, $762$:
 * $7 + 7 + 8 = 2 + 3 + 8 + 9 = 22$