630
The Gateway Arch is 630 feet tall and 630 feet wide.
- Even
- Composite
Where 630 fits
Why 630 is special
Its height and span are identical, which is unusual and deliberate. The curve is a weighted catenary — the shape a hanging chain takes, inverted — chosen because it carries its own weight in pure compression.
630 is part of
Factors & digit properties
- Divisors (24)
- 1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 30, 35, 42, 45, 63, 70, 90, 105, 126, 210, 315, 630
- Prime factorisation
- 2 × 3^2 × 5 × 7
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 630
- Binary
- 1001110110
- Octal
- 1166
- Hexadecimal
- 276
- Roman numeral
- DCXXX
- Scientific notation
- 6.300 × 10^2
Other mathematical patterns
- Triangular number
- Abundant number
- Hexagonal number
- Harshad (Niven) number
Related numbers & connections
The Gateway Arch stands in pure compression as an inverted catenary; the Eiffel Tower is a lattice carrying load in tension and compression together. Two different answers to holding up a tall structure.
View 324 →Other connections
- contrasts with324
why?
Strength 0.50, confidence "high".
Technology & computing
The Gateway Arch is a weighted catenary, the inverted form of a freely hanging chain. That curve puts the structure entirely in compression, which is why it needs no internal bracing.
DocumentedTechnology & computingGeography: St Louis, United States
Common questions
Is 630 a prime number?
No, 630 is not prime.
What are the factors of 630?
The factors of 630 are 1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 30, 35, 42, 45, 63, 70, 90, 105, 126, 210, 315, 630.
What is 630 in Roman numerals?
630 in Roman numerals is DCXXX.
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