1782 is 3 Times Sum of all 2-Digit Numbers from its Digits

Theorem
$1782$ equals $3$ multiplied by the sum of all the $2$-digit integers that can be formed from its digits.

Proof
The number of $2$-digit integers that can be formed from the digits of $1782$ equals the number of $2$-permutations of $\left\{{1, 7, 8, 2}\right\}$.

That is:
 * $\left\{{17, 18, 12, 71, 78, 72, 81, 87, 82, 21, 27, 28}\right\}$

Hence:
 * $17 + 18 + 12 + 71 + 78 + 72 + 81 + 87 + 82 + 21 + 27 + 28 = 594 = \dfrac {1782} 3$