Numberwise

270

270 is the number of votes needed to win a majority in the United States Electoral College — more than half of the 538 total votes — and thus the number needed to win the U.S. presidency.

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Where 270 fits

Where 270 fits: Mathematics, Related numbersMathematics: Harshad (Niven) number. Related numbers: 90.MathematicsHarshad (Niven) numberRelated numbers90270
270 connects to 2 worlds: mathematics, related numbers.

Why 270 is special

270 is the single most quoted number in American presidential elections: with 538 total Electoral College votes at stake, a candidate needs 270 to secure a majority and win the presidency, regardless of the national popular-vote total.

Same number, different meanings

How 270 is understood across different contexts — never implying one meaning because of another.

Factors & digit properties

Divisors (16)
1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270
Prime factorisation
2 × 3^3 × 5
Digit sum
9
Digital root
9

Representations

Decimal
270
Scientific notation
2.700 × 10^2

Roman numerals

C C L X X

Binary

1 0 0 0 0 1 1 1 0

1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 270

Octal

4 1 6

4 × 64 + 1 × 8 + 6 × 1 = 270

Hexadecimal

1 0 e

1 × 256 + 0 × 16 + e × 1 = 270

Read as powers of two: 256 + 8 + 4 + 2 = 270.

In historical numeral systems

Egyptian

2 coils of rope, 7 hobbles

2 × 100 + 7 × 10 = 270. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

Babylonian

4 vertical wedges (sixties place), 3 corner wedges (units place)

4 × 60 + 30 = 270. Places are separated by a space on the tablet, with the higher place written first.

Greek (Ionic)

sigma, then omicron, marked as a numeral

sigma-omicron + keraia

sigma + omicron written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.

Hebrew numerals

resh, then ayin

resh-ayin

resh (200) + ayin (70) = 270, written in descending order.

Maya

2 bars + 3 dots (upper, twenties place) over 2 bars (lower, units place)

13 × 20 + 10 = 270. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.

Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.

Other mathematical patterns

  • Abundant number
  • Harshad (Niven) number

Related numbers & connections

Mathematical relationship
270 is a multiple of 90 (90 × 3 = 270).

270 is a multiple of 90 (90 × 3 = 270).

View 90 →

Mathematically related

  • is a multiple of90
    why?

    Strength 0.50, confidence "high".

How is 270 connected to another number? →

Law & regulation

  • The United States Electoral College has 538 total votes; 270 is the majority threshold a presidential candidate must reach to win the presidency, as set out in U.S. constitutional and federal election law.

    DocumentedLaw & regulationGeography: United States

Media & popular culture

  • '270 to win' is a common shorthand used across U.S. television and online election-night coverage to track a candidate's progress toward the Electoral College majority in real time.

    Widely documentedMedia & popular cultureGeography: United States

Common questions

Is 270 a prime number?

No, 270 is not prime.

What are the factors of 270?

The factors of 270 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270.

What is 270 in Roman numerals?

270 in Roman numerals is CCLXX.

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: 15 July 2026