8128

Number
$8128$ (eight thousand one hundred and twenty-eight) is:


 * $2^6 \times 127$


 * The $4$th perfect number after $6, 28, 496$:
 * $8128 = 1 + 2 + 4 + 8 + 16 + 32 + 64 + 127 + 254 + 508 + 1016 + 2032 + 4064 = \sigma \left({8128}\right) - 8128 = 64 \times 127 = 2^{7 - 1} \left({2^7 - 1}\right)$