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90 is the only number to have an aliquot sum of 144 = 12 2. Only three numbers have a set of divisors that generate a sum equal to 90, they are 40, 58, and 89. [3] 90 is also the twentieth abundant [4] and highly abundant [5] number (with 20 the first primitive abundant number and 70 the second). [6] The number of divisors of 90 is 12. [7]
The name of a number 10 3n+3, where n is greater than or equal to 1000, is formed by concatenating the names of the numbers of the form 10 3m+3, where m represents each group of comma-separated digits of n, with each but the last "-illion" trimmed to "-illi-", or, in the case of m = 0, either "-nilli-" or "-nillion". [17]
Koppa or qoppa (Ϙ, ϙ; as a modern numeral sign: ϟ) is a letter that was used in early forms of the Greek alphabet, derived from Phoenician qoph (𐤒).It was originally used to denote the /k/ sound, but dropped out of use as an alphabetic character and replaced by Kappa (Κ).
Uppercase forms of stigma as a numeral (Ϛ) are rare in practice; when they occur, they can often be confused with uppercase forms of another numeral symbol, koppa (Ϟϟ), which stands for 90. Stigma is encoded in Unicode as "Greek letter stigma" U+03DA (Ϛ) and "Greek small letter stigma" U+03DB (ϛ).
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In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or / 2 radians [1] corresponding to a quarter turn. [2] If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. [3]
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A report from the U.S. surgeon general suggested that labels on alcoholic drinks should warn about cancer risk. Doctors expressed their agreement. For people wondering about the long-term damage ...