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A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers...

A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that...

number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and...

In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted i, called the imaginary...

the number 1 differently than larger numbers, sometimes even not as a number at all. Euclid, for example, defined a unit first and then a number as a...

666 (six hundred [and] sixty-six) is the natural number following 665 and preceding 667. In Christianity, 666 is referred to in (most manuscripts of) chapter...

In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a distance, duration or temperature...

In fluid dynamics, the Reynolds number (Re) is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the...

In mathematics, a rational number is a number that can be expressed as the quotient or fraction ⁠ p q {\displaystyle {\tfrac {p}{q}}} ⁠ of two integers...

A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic...

The following are lists of films which have been placed number one at the weekend box office in a region. Contents 1948–1959 1960–1969 1970–1979 1980–1989...

number (7 × 11 × 13), pentagonal number, pentatope number, palindromic number 1002 = sphenic number, Mertens function zero, abundant number, number of...

The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. Publishers purchase or receive ISBNs...

fourteen) is the natural number following 113 and preceding 115. 114 is an abundant number, a sphenic number and a Harshad number. It is the sum of the first...

Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic...

202 (two hundred [and] two) is the natural number following 201 and preceding 203. 202 is a Smith number, meaning that its digit sum and the sum of digits...

This is a list of countries by the number of millionaires by net worth (in United States dollars) based on an annual assessment of wealth and assets compiled...

In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci...

67 (sixty-seven) is the natural number following 66 and preceding 68. It is an odd number. 67 is: the 19th prime number (the next is 71). a Chen prime...

In number theory, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. A...