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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    The Colosseum was constructed in Rome in CE 72–80, [61] and while the original perimeter wall has largely disappeared, the numbered entrances from XXIII (23) to LIIII (54) survive, [62] to demonstrate that in Imperial times Roman numerals had already assumed their classical form: as largely standardised in current use.

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Can be notated with the digits 0–9 and the cased letters A–Z and a–z of the English alphabet. 64: Tetrasexagesimal: I Ching in China. This system is conveniently coded into ASCII by using the 26 letters of the Latin alphabet in both upper and lower case (52 total) plus 10 numerals (62 total) and then adding two special characters (+ and ...

  4. 72 (number) - Wikipedia

    en.wikipedia.org/wiki/72_(number)

    It is a highly totient number, as there are 17 solutions to the equation φ(x) = 72, more than any integer under 72. [8] It is equal to the sum of its preceding smaller highly totient numbers 24 and 48 , and contains the first six highly totient numbers 1 , 2 , 4 , 8 , 12 and 24 as a subset of its proper divisors .

  5. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In 493 AD, Victorius of Aquitaine wrote a 98-column multiplication table which gave (in Roman numerals) the product of every number from 2 to 50 times and the rows were "a list of numbers starting with one thousand, descending by hundreds to one hundred, then descending by tens to ten, then by ones to one, and then the fractions down to 1/144." [6]

  6. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Roman numerals: The numeral system of ancient Rome, still occasionally used today, mostly in situations that do not require arithmetic operations. Tally marks: Usually used for counting things that increase by small amounts and do not change very quickly. Fractions: A representation of a non-integer as a ratio of two integers.

  7. 10,000,000 - Wikipedia

    en.wikipedia.org/wiki/10,000,000

    24,678,050 = equal to the sum of the eighth powers of its digits 24,684,612 = 1 8 + 2 8 + 3 8 + 4 8 + 5 8 + 6 8 + 7 8 + 8 8 [ 22 ] 24,883,200 = superfactorial of 6

  8. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    The Roman numerals developed from Etruscan symbols around the middle of the 1st millennium BCE. [34] In the Etruscan system, the symbol 1 was a single vertical mark ...

  9. 27 (number) - Wikipedia

    en.wikipedia.org/wiki/27_(number)

    The Moon revolves around the Earth the same direction as Earth spins but 27 (27.3) times slower. 27km is the circumference of the LHC located at CERN in Meyrin Switzerland; The atomic number of cobalt. Dark matter is thought to make up 27% of the universe. [12] 27 is the number of bones in the human hand. [13]