555

Here are quick notes about the number 555. Tell me if you want a practice problem on any of these topics.

• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Number of divisors: 8
• Sum of all divisors (including itself): 912
• Sum of proper divisors (excluding itself): 912 − 555 = 357
  • So 555 is deficient (proper divisors sum to less than the number)
• Roman numeral: DLV
• Binary: 555 = 1000101011_2
• Octal: 555 = 1053_8
• Hexadecimal: 555 = 0x22B

Would you like a quick practice problem (e.g., factorization, divisors, or a base-conversion exercise) based on 555?