1648

Number
$1648$ (one thousand six hundred and forty-eight) is:


 * $2^4 \times 103$


 * With $1648$, an element of the $4$th quasiamicable pair:
 * $\map \sigma {1575} = \map \sigma {1648} = 3224 = 1575 + 1648 + 1$