555

Could you clarify what you want with “555”? Here are quick options:

• Quick math facts about the number 555
• A practice problem (e.g., number theory) using 555
• Something about the 555 timer IC (electronics)
• Any other context you have for your exam

If you’d like, here are a few quick math facts to start:

• Prime factorization: 555 = 3 × 5 × 37
• Binary: 555 = 1000101011₂
• Hexadecimal: 555 = 0x22B
• Roman numeral: DLV
• Sum of divisors: σ(555) = (1+3)(1+5)(1+37) = 4 × 6 × 38 = 912
  • Proper divisors sum = 912 − 555 = 357

Would you like me to turn this into a quick practice problem, or dive into a different angle (timer IC, base conversions, etc.)?