278,886

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Number

$278 \, 886$ (two hundred and seventy-eight thousand, eight hundred and eighty-six) is:

$2 \times 3 \times 53 \times 877$


Has a square which starts with a remarkably long string of $7$s:
$278 \, 886^2 = 77 \, 777 \, 400 \, 996$


Sources