6400

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Number

$6400$ (six thousand, four hundred) is:

$2^8 \times 5^2$


The $31$st square number after $1$, $4$, $36$, $121$, $144$, $256$, $\ldots$, $5184$, $5776$, $6084$ to be the divisor sum value of some (strictly) positive integer:
$6400 = \map {\sigma_1} {3591} = \map {\sigma_1} {4179} = \map {\sigma_1} {4503} = \map {\sigma_1} {6169}$


The $80$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $5041$, $5184$, $5329$, $5476$, $5625$, $5776$, $5929$, $6084$, $6241$
$6400 = 80 \times 80$


Also see