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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]
99.3 is "ninety-nine point three"; or "ninety-nine and three tenths" (U.S., occasionally). In English the decimal point was originally printed in the center of the line (0·002), but with the advent of the typewriter it was placed at the bottom of the line, so that a single key could be used as a full stop/period and as a decimal point.
In this table, The first cell in each row gives a symbol; The second is a link to the article that details that symbol, using its Unicode standard name or common alias.
99 is: . a composite number; a square-prime, of the form (p 2, q).It is the 11th composite number of this form and the third of the form (3 2, q).It has an aliquot sum of 57, within an aliquot sequence of two composite numbers (99,57,23,1,0), to the Prime in the 23-aliquot tree.
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The Indian system groups digits of a large decimal representation differently than the US and other English-speaking regions. The Indian system does group the first three digits to the left of the decimal point. But thereafter, groups by two digits to align with the naming of quantities at multiples of 100. [2]
Its arithmetic mean of its six divisors [3] is twenty-eight, [4] [5] where (6, 28) represent the first two perfect numbers. [6] It is the sixtieth arithmetic number, where 60 is the second unitary perfect number (the next such number is 90). For =, there are 92 solutions in the n-Queens Problem. 92 is the eighth pentagonal number. [7]