Owlet puzzle #8
Released Monday, July 13, 2026 UTC
8128
the answer for puzzle #8
The five clues
- A four-digit number.
- A perfect number.
- The fourth one.
- 8128 = 2⁶ · (2⁷−1) = 64 · 127.
- Its divisor sum σ(n) equals 2n exactly.
Backstory
Fourth perfect number. After 8128, the next is 33,550,336.
▶ Play puzzle #8 in practice mode
Or try today's fresh puzzle · Browse the full archive