1600

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Number

$1600$ (one thousand six hundred) is:

$2^6 \times 5^2$


The $15$th square number after $1$, $4$, $36$, $121$, $144$, $256$, $324$, $400$, $576$, $784$, $900$, $961$, $1024$, $1296$ to be the divisor sum value of some (strictly) positive integer:
$1600 = \map {\sigma_1} {1029} = \map {\sigma_1} {1393} = \map {\sigma_1} {1501}$


The $40$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $1024$, $1089$, $1156$, $1225$, $1296$, $1369$, $1444$, $1521$:
$1600 = 40 \times 40$


Also see