555

Do you want something specific about the number 555? Here are quick math facts you can use for exams:

• Prime factorization: 555 = 3 × 5 × 37
• Divisible by: 3, 5 (ends in 5), hence by 15
• Number of divisors: 8 (since 555 = 3^1 × 5^1 × 37^1 → (1+1)(1+1)(1+1) = 8)
• Sum of divisors: 912; sum of proper divisors: 912 − 555 = 357
• Palindrome: yes (555 reads the same forward and back)
• Roman numeral: DLV
• Binary: 1000101011
• Hexadecimal: 0x22B
• Base-3: 202120_3
• Base-7: 1422_7
• Harshad (Niven) number: yes (555 is divisible by the sum of its digits 5+5+5 = 15)

If you want, I can generate some exam-style practice problems involving 555 (factorization, divisors, modular arithmetic, base conversions, etc.). What would be most helpful?