626
K.626 is Mozart's Requiem, left unfinished at his death.
- Even
- Composite
Where 626 fits
Why 626 is special
He completed only the opening and fragments of the rest. The version usually performed was finished by a pupil, and which passages are Mozart's is still argued over by scholars.
Same number, different meanings
How 626 is understood across different contexts — never implying one meaning because of another.
- Mathematics
He completed only the opening and fragments of the rest. The version usually performed was finished by a pupil, and which passages are Mozart's is still argued over by scholars.
- Culture
Mozart died with the Requiem substantially incomplete and it was finished by Süssmayr. Which sections are Mozart's, which are reconstructed from sketches and which are invented remains a scholarly dispute.
- Media & popular culture
K. 626 was left incomplete at Mozart's death and completed by Süssmayr. Which passages are Mozart's own remains a live scholarly question, and several alternative completions exist.
626 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 313, 626
- Prime factorisation
- 2 × 313
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 626
- Scientific notation
- 6.260 × 10^2
Roman numerals
D C X X V I
Binary
1 0 0 1 1 1 0 0 1 0
1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 626
Octal
1 1 6 2
1 × 512 + 1 × 64 + 6 × 8 + 2 × 1 = 626
Hexadecimal
2 7 2
2 × 256 + 7 × 16 + 2 × 1 = 626
Read as powers of two: 512 + 64 + 32 + 16 + 2 = 626.
In historical numeral systems
Egyptian
6 coils of rope, 2 hobbles, 6 strokes
6 × 100 + 2 × 10 + 6 × 1 = 626. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge (sixties place), 2 corner wedges + 6 vertical wedges (units place)
10 × 60 + 26 = 626. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then kappa, then stigma, marked as a numeral
chi-kappa-stigma + keraia
chi + kappa + stigma 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 resh, then kaf, then vav
tav-resh-kaf-vav
tav (400) + resh (200) + kaf (20) + vav (6) = 626, 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
- Palindromic number
- Deficient number
- Semiprime
Related numbers & connections
Köchel numbers order Mozart's works chronologically, so K.550 and K.626 are separated by his last three years.
View 550 →Other connections
- is associated with550
why?
Strength 0.50, confidence "high".
Culture
Mozart died with the Requiem substantially incomplete and it was finished by Süssmayr. Which sections are Mozart's, which are reconstructed from sketches and which are invented remains a scholarly dispute.
DocumentedCultureGeography: AustriaPeriod: 1791
Media & popular culture
K. 626 was left incomplete at Mozart's death and completed by Süssmayr. Which passages are Mozart's own remains a live scholarly question, and several alternative completions exist.
DocumentedMedia & popular cultureGeography: AustriaPeriod: 1791
Common questions
Is 626 a prime number?
No, 626 is not prime.
What are the factors of 626?
The factors of 626 are 1, 2, 313, 626.
What is 626 in Roman numerals?
626 in Roman numerals is DCXXVI.
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