1964
1964 is the year the US Civil Rights Act was signed.
- Even
- Composite
Where 1964 fits
Why 1964 is special
It outlawed segregation in public accommodations and discrimination in employment, and passed only after the longest filibuster in Senate history. The Voting Rights Act followed the next year, because the 1964 Act had left voting largely untouched.
Same number, different meanings
How 1964 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It outlawed segregation in public accommodations and discrimination in employment, and passed only after the longest filibuster in Senate history. The Voting Rights Act followed the next year, because the 1964 Act had left voting largely untouched.
- History
In 1964, the Civil Rights Act outlawed major forms of discrimination in the United States (North America).
- Law & regulation
The Civil Rights Act outlawed segregation in public accommodations and employment discrimination, passing after the longest filibuster in Senate history. It left voting rights largely untouched, which is precisely why a separate Voting Rights Act was needed the following year.
1964 is part of
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 491, 982, 1964
- Prime factorisation
- 2^2 × 491
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 1964
- Scientific notation
- 1.964 × 10^3
Roman numerals
M C M L X I V
MCMLXIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 1 1 0 1 0 1 1 0 0
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 1,964
Octal
3 6 5 4
3 × 512 + 6 × 64 + 5 × 8 + 4 × 1 = 1,964
Hexadecimal
7 a c
7 × 256 + a × 16 + c × 1 = 1,964
Read as powers of two: 1,024 + 512 + 256 + 128 + 32 + 8 + 4 = 1,964.
In historical numeral systems
Egyptian
1 lotus, 9 coils of rope, 6 hobbles, 4 strokes
1 × 1,000 + 9 × 100 + 6 × 10 + 4 × 1 = 1,964. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 2 vertical wedges (sixties place), 4 corner wedges + 4 vertical wedges (units place)
32 × 60 + 44 = 1964. Places are separated by a space on the tablet, with the higher place written first.
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
- Deficient number
Related numbers & connections
1964 is a year in the 20th century, in the 1960s.
The Higgs boson was predicted in 1964 and confirmed in 2012 — forty-eight years, and a collider built substantially to look for it.
View 2012 →History
In 1964, the Civil Rights Act outlawed major forms of discrimination in the United States (North America).
DocumentedHistoryGeography: North AmericaPeriod: 1964
Law & regulation
The Civil Rights Act outlawed segregation in public accommodations and employment discrimination, passing after the longest filibuster in Senate history. It left voting rights largely untouched, which is precisely why a separate Voting Rights Act was needed the following year.
DocumentedLaw & regulationGeography: United StatesPeriod: 1964
Common questions
Is 1964 a prime number?
No, 1964 is not prime.
What are the factors of 1964?
The factors of 1964 are 1, 2, 4, 491, 982, 1964.
What is 1964 in Roman numerals?
1964 in Roman numerals is MCMLXIV. IV is subtractive: one before five — five minus one. Written additively it would be MDCCCCLXIIII, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026