Numberwise

480

480 lines is standard-definition video, and 480 Mbit/s is USB 2.0's speed.

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Where 480 fits

Where 480 fits: Mathematics, Related numbersMathematics: Harshad (Niven) number. Related numbers: 490, 300, 1080, 42195.MathematicsHarshad (Niven) numberRelated numbers490300108042195480
480 connects to 2 worlds: mathematics, related numbers.

Why 480 is special

The two are unrelated and both were the baseline of their era. NTSC's 480 visible lines governed television for half a century, and USB 2.0's 480 Mbit/s made external hard drives practical.

480 connects to:

  • 490 — appears alongside
  • 300 — is associated with
  • 1080 — contrasts with
  • 42195 — is associated with

Same number, different meanings

How 480 is understood across different contexts — never implying one meaning because of another.

Factors & digit properties

Divisors (24)
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 80, 96, 120, 160, 240, 480
Prime factorisation
2^5 × 3 × 5
Digit sum
12
Digital root
3

Representations

Decimal
480
Binary
111100000
Octal
740
Hexadecimal
1e0
Roman numeral
CDLXXX
Scientific notation
4.800 × 10^2

Other mathematical patterns

  • Abundant number
  • Harshad (Niven) number

Related numbers & connections

Documented appearance
Marathon in 490 BC and Thermopylae and Salamis ten years later are the two Persian invasions of Greece. The first was repelled by Athens alone and the second required a Greek coalition.

Marathon in 490 BC and Thermopylae and Salamis ten years later are the two Persian invasions of Greece. The first was repelled by Athens alone and the second required a Greek coalition.

View 490 →
Connection
Thermopylae in 480 BC is remembered as 300 Spartans, and about 7,000 Greeks held the pass. The figure is accurate about one contingent and misleading about the battle.

Thermopylae in 480 BC is remembered as 300 Spartans, and about 7,000 Greeks held the pass. The figure is accurate about one contingent and misleading about the battle.

View 300 →

Numbers Around Us

  • appears alongside490
    why?

    Strength 0.50, confidence "high".

Other connections

  • is associated with300
    why?

    Strength 0.50, confidence "high".

  • contrasts with1080
    why?

    Strength 0.50, confidence "high".

  • is associated with42195
    why?

    Strength 0.50, confidence "high".

How is 480 connected to another number? →

History

  • Thermopylae delayed the Persian advance and Salamis ended the invasion by destroying the fleet that supplied it. The defeat is far better remembered than the victory.

    DocumentedHistoryGeography: GreecePeriod: 480 BC

Technology & computing

  • 480 describes both the visible lines of standard-definition television and the megabits per second of USB 2.0. Neither derives from the other; both happened to define the ordinary case for their period.

    DocumentedTechnology & computing

Common questions

Is 480 a prime number?

No, 480 is not prime.

What are the factors of 480?

The factors of 480 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 80, 96, 120, 160, 240, 480.

What is 480 in Roman numerals?

480 in Roman numerals is CDLXXX.

About this page's data

Mathematical facts:computed directly from the number's value — nothing to source or verify externally.

Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.

Last reviewed: 3 August 2026