1782

Number
$1782$ (one thousand, seven hundred and eighty-two) is:
 * $2 \times 3^4 \times 11$


 * The $27$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $874$, $970$, $1071$, $1177$, $1288$, $1404$, $1525$, $1651$:
 * $1782 = \displaystyle \sum_{k \mathop = 1}^{27} \left({5 k - 4}\right) = \dfrac {27 \left({5 \times 27 - 3}\right)} 2$


 * $3$ times the sum of all the $2$-digit integers that can be formed from its digits:
 * $1782 = 3 \times 594 = 3 \times \left({17 + 18 + 12 + 71 + 78 + 72 + 81 + 87 + 82 + 21 + 27 + 28}\right)$

Also see

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