7777

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Number

$7777$ (seven thousand, seven hundred and seventy-seven) is:

$7 \times 11 \times 101$

The $16$th Kaprekar number after $1$, $9$, $45$, $55$, $99$, $297$, $703$, $999$, $2223$, $2728$, $4879$, $4950$, $5050$, $5292$, $7272$:

$7777^2 = 60 \, 481 \, 729 \to 6048 + 1729 = 7777$

Also see

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Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $6666$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $6666$