- published: 29 May 2014
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8 (eight /ˈeɪt/) is the natural number following 7 and preceding 9. The SI prefix for 10008 is yotta (Y), and for its reciprocal, yocto (y). It is the root word of two other numbers: eighteen (eight and ten) and eighty (eight tens). Linguistically, it is derived from Middle English eighte.[citation needed]
8 is a composite number, its proper divisors being 1, 2, and 4. It is twice 4 or four times 2. Eight is a power of two, being Failed to parse (Missing texvc executable; please see math/README to configure.): 2^3
, p being greater than 1. It has an aliquot sum of 7 in the 4 member aliquot sequence (8,7,1,0) being the first member of 7-aliquot tree. It is symbolized by the Arabic numeral (figure)
All powers of 2 ;(Failed to parse (Missing texvc executable; please see math/README to configure.): 2^x ), have an aliquot sum of one less than themselves.
A number is divisible by 8 if its last 3 digits are also divisible by 8.
Eight is the first number to be the aliquot sum of two numbers other than itself; the discrete biprime 10, and the square number 49.
A number is a mathematical object used to count and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational numbers, irrational numbers, and complex numbers.
Mathematical operations are certain procedures that take one or more numbers as input and produce a number as output. Unary operations take a single input number and produce a single output number. For example, the successor operation adds one to an integer, thus the successor of 4 is 5. Binary operations take two input numbers and produce a single output number. Examples of binary operations include addition, subtraction, multiplication, division, and exponentiation. The study of numerical operations is called arithmetic.
A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (telephone numbers), for ordering (serial numbers), and for codes (e.g., ISBNs).