350

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Number

$350$ (three hundred and fifty) is:

$2 \times 5^2 \times 7$

The $8$th primitive semiperfect number after $6, 20, 28, 88, 104, 272, 304$:

$350 = 1 + 5 + 14 + 35 + 50 + 70 + 175$

The $18$th integer after $7$, $13$, $19$, $35$, $38$, $41$, $57$, $65$, $70$, $125$, $130$, $190$, $205$, $223$, $253$, $285$, $305$ the decimal representation of whose square can be split into two parts which are each themselves square:

$350^2 = 122 \, 500$; $1 = 1^2$, $22 \, 500 = 150^2$

Also see

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