2556

Number
$2556$ (two thousand, five hundred and fifty-six) is:
 * $2^2 \times 3^2 \times 71$


 * The largest term of the amicable triplet $\left({1980, 2016, 2556}\right)$:
 * $\sigma \left({1980}\right) = \sigma \left({2016}\right) = \sigma \left({2556}\right) = 6552 = 1980 + 2016 + 2556$