2728

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Number

$2728$ (two thousand, seven hundred and twenty-eight) is:

$2^3 \times 11 \times 31$

The $10$th Kaprekar number after $1$, $9$, $45$, $55$, $99$, $297$, $703$, $999$, $2223$:

$2728^2 = 7 \, 441 \, 984 \to 744 + 1984 = 2728$

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