1687
1687 is the year Newton published the Principia.
- Odd
- Composite
Where 1687 fits
Why 1687 is special
The Principia set out the laws of motion and universal gravitation and showed that the same rules govern a falling apple and an orbiting moon. It was written in Latin, in geometric rather than algebraic form, and Halley paid for the printing himself.
Same number, different meanings
How 1687 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The Principia set out the laws of motion and universal gravitation and showed that the same rules govern a falling apple and an orbiting moon. It was written in Latin, in geometric rather than algebraic form, and Halley paid for the printing himself.
- Science
The Principia showed that one set of laws governs a falling apple and an orbiting moon. It was written in Latin and argued geometrically rather than algebraically, and Halley funded the printing personally when the Royal Society could not.
- Technology & computing
IEEE 1687, known as IJTAG, standardises access to instrumentation embedded in a device, extending the boundary scan interface inward to sensors and built-in self-test.
Factors & digit properties
- Divisors (4)
- 1, 7, 241, 1687
- Prime factorisation
- 7 × 241
- Digit sum
- 22
- Digital root
- 4
Representations
- Decimal
- 1687
- Binary
- 11010010111
- Octal
- 3227
- Hexadecimal
- 697
- Roman numeral
- MDCLXXXVII
- Scientific notation
- 1.687 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Newtonian gravitation is what let astronomers infer an unseen planet from orbital irregularities — the method that found Uranus's successor and confirmed the theory that predicted it.
View 1781 →Other connections
Science
The Principia showed that one set of laws governs a falling apple and an orbiting moon. It was written in Latin and argued geometrically rather than algebraically, and Halley funded the printing personally when the Royal Society could not.
DocumentedSciencePeriod: 1687
Technology & computing
IEEE 1687, known as IJTAG, standardises access to instrumentation embedded in a device, extending the boundary scan interface inward to sensors and built-in self-test.
DocumentedTechnology & computingGeography: International — IEEEPeriod: 2014–
Common questions
Is 1687 a prime number?
No, 1687 is not prime.
What are the factors of 1687?
The factors of 1687 are 1, 7, 241, 1687.
What is 1687 in Roman numerals?
1687 in Roman numerals is MDCLXXXVII.
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: 3 August 2026