828
The Burj Khalifa is 828 metres tall.
- Even
- Composite
Where 828 fits
Why 828 is special
It has held the record for tallest structure since 2010, an unusually long tenure — the title changed hands eleven times in the preceding century. Its buttressed core design is what let it exceed previous heights by a margin rather than incrementally.
828 is part of
Factors & digit properties
- Divisors (18)
- 1, 2, 3, 4, 6, 9, 12, 18, 23, 36, 46, 69, 92, 138, 207, 276, 414, 828
- Prime factorisation
- 2^2 × 3^2 × 23
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 828
- Binary
- 1100111100
- Octal
- 1474
- Hexadecimal
- 33c
- Roman numeral
- DCCCXXVIII
- Scientific notation
- 8.280 × 10^2
Other mathematical patterns
- Palindromic number
- Abundant number
- Harshad (Niven) number
Related numbers & connections
The Petronas Towers took the height record in 1998 because spires count as architecture and antennas do not. The Burj Khalifa exceeded it by a margin large enough that the definition stopped mattering.
View 452 →Technology & computing
The Burj Khalifa has been the tallest structure since 2010. Height records changed roughly every decade through the twentieth century, so holding it for fifteen years reflects a genuine step change rather than a small increment.
DocumentedTechnology & computingGeography: Dubai, United Arab EmiratesPeriod: 2010
Common questions
Is 828 a prime number?
No, 828 is not prime.
What are the factors of 828?
The factors of 828 are 1, 2, 3, 4, 6, 9, 12, 18, 23, 36, 46, 69, 92, 138, 207, 276, 414, 828.
What is 828 in Roman numerals?
828 in Roman numerals is DCCCXXVIII.
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: 3 August 2026