Numberwise

928

The Porsche 928 was intended to replace the 911.

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Where 928 fits

Where 928 fits: Related numbersRelated numbers: 911, 944.Related numbers911944928
928 connects to 1 world: related numbers.

Why 928 is special

It was a front-engined V8 grand tourer, it won European Car of the Year, and customers kept buying the car it was meant to succeed instead.

Factors & digit properties

Divisors (12)
1, 2, 4, 8, 16, 29, 32, 58, 116, 232, 464, 928
Prime factorisation
2^5 × 29
Digit sum
19
Digital root
1

Representations

Decimal
928
Scientific notation
9.280 × 10^2

Roman numerals

C M X X V I I I

CMXXVIII uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.

Binary

1 1 1 0 1 0 0 0 0 0

1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 928

Octal

1 6 4 0

1 × 512 + 6 × 64 + 4 × 8 + 0 × 1 = 928

Hexadecimal

3 a 0

3 × 256 + a × 16 + 0 × 1 = 928

Read as powers of two: 512 + 256 + 128 + 32 = 928.

In historical numeral systems

Egyptian

9 coils of rope, 2 hobbles, 8 strokes

9 × 100 + 2 × 10 + 8 × 1 = 928. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

Babylonian

1 corner wedge + 5 vertical wedges (sixties place), 2 corner wedges + 8 vertical wedges (units place)

15 × 60 + 28 = 928. Places are separated by a space on the tablet, with the higher place written first.

Greek (Ionic)

sampi, then kappa, then eta, marked as a numeral

sampi-kappa-eta + keraia

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

Hebrew numerals

tav, then tav, then qof, then kaf, then het

tav-tav-qof-kaf-het

tav (400) + tav (400) + qof (100) + kaf (20) + het (8) = 928, written in descending order.

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

Related numbers & connections

Connection
The 928 was built to replace the 911, won European Car of the Year, and was discontinued while the 911 continued.

The 928 was built to replace the 911, won European Car of the Year, and was discontinued while the 911 continued.

View 911 →

Other connections

  • contrasts with911
    why?

    Strength 0.50, confidence "high".

  • developed from944
    why?

    Strength 0.50, confidence "high".

How is 928 connected to another number? →

Technology & computing

  • The Porsche 928 was produced from 1977 to 1995 as a front-engined V8 intended as the 911's successor. The 911 remained in production and the 928 was discontinued first.

    DocumentedTechnology & computingGeography: GermanyPeriod: 1977–1995

Common questions

Is 928 a prime number?

No, 928 is not prime.

What are the factors of 928?

The factors of 928 are 1, 2, 4, 8, 16, 29, 32, 58, 116, 232, 464, 928.

What is 928 in Roman numerals?

928 in Roman numerals is CMXXVIII. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be DCCCCXXVIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.

About this page's data

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

Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.

Last reviewed: 15 July 2026