555

Not sure what you need with 555. Here are a few quick options you might find handy for exams. Pick one or tell me what you’re working on.

• Math fact: 555 = 3 × 5 × 37.

  • Number of divisors: 8
  • Sum of divisors: 912
  • Binary: 1000101011
  • Octal: 1053, Hex: 0x22B, Roman: DLV

• Time/base conversions:

  • 555 in hours: 5 + 55/60 = 5.9167 hours
  • If you’re converting bases: decimal 555 = binary 1000101011, octal 1053, hex 0x22B

• If you’re studying electronics: 555 timer in astable mode uses f ≈ 1.44 / ((RA + 2 RB) C)

• Quick practice problem: Find all divisors of 555 and verify sum of divisors is 912.

If you tell me your subject (math, CS, electronics, etc.) I can tailor a problem or explanation.