8,388,608

Number
$8 \, 388 \, 608$ (eight million, three hundred and eighty-eight thousand, six hundred and eight) is:
 * $2^{23}$


 * The $23$rd power of $2$ after $(1)$, $2$, $4$, $8$, $16$, $\ldots$, $131 \, 072$, $262 \, 144$, $524 \, 288$, $1 \, 048 \, 576$, $2 \, 097 \, 152$, $4 \, 194 \, 304$:
 * $8 \, 388 \, 608 = 2^{23}$


 * The $24$th almost perfect number after $1$, $2$, $4$, $8$, $16$, $\ldots$, $65 \, 536$, $131 \, 072$, $262 \, 144$, $524 \, 288$, $1 \, 048 \, 576$, $2 \, 097 \, 152$, $4 \, 194 \, 304$:
 * $\map \sigma {8 \, 388 \, 608} = 16 \, 777 \, 215 = 2 \times 8 \, 388 \, 608 - 1$