828,828

Number
$828 \, 828$ (eight hundred and twenty-eight thousand, eight hundred and twenty-eight) is:


 * $2^2 \times 3^2 \times 7 \times 11 \times 13 \times 23$


 * The $16$th palindromic triangular number after $0$, $1$, $3$, $6$, $55$, $66$, $171$, $595$, $666$, $3003$, $5995$, $8778$, $15 \, 051$, $66 \, 066$, $617 \, 716$:
 * $828 \, 828 = \dfrac {1287 \times \paren {1287 + 1} } 2$


 * The $3$rd of those after $55$, $66$, and largest known, which can be split into two palindromic halves


 * The $1287$th triangular number:
 * $828 \, 828 = \dfrac {1287 \times \paren {1287 + 1} } 2$