778

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Number

$778$ (seven hundred and seventy-eight) is:

$2 \times 389$

The $40$th Smith number after $4$, $22$, $27$, $58$, $\ldots$, $648$, $654$, $663$, $666$, $690$, $706$, $728$, $729$, $762$:

$7 + 7 + 8 = 2 + 3 + 8 + 9 = 22$

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