- published: 28 Jan 2011
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45 (forty-five) is the natural number following 44 and followed by 46.
Forty-five is a triangular number, a hexagonal and 16-gonal number, a Kaprekar number, and a Harshad number.
45 is the sixth positive integer with a prime factorization of the form p2q, with p and q being prime.
33 is the aliquot sum of 45 and the aliquot sequence of 45 is (45, 33, 15, 9, 4, 3, 1, 0).
Since the greatest prime factor of 452 + 1 = 2026 is 1013, which is clearly more than 45 twice, 45 is a Størmer number.
The sum of all the digits is 45 (casually the sum of both digits is 9)(0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45).
Forty-five may also refer to:
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).
Michael Jeffrey Jordan (born February 17, 1963) is a retired American professional basketball player, active entrepreneur, and majority owner of the Charlotte Bobcats. His biography on the National Basketball Association (NBA) website states, "By acclamation, Michael Jordan is the greatest basketball player of all time." Jordan was one of the most effectively marketed athletes of his generation and was considered instrumental in popularizing the NBA around the world in the 1980s and 1990s.
After a three-season career at the University of North Carolina at Chapel Hill, where he was a member of the Tar Heels' national championship team in 1982, Jordan joined the NBA's Chicago Bulls in 1984. He quickly emerged as a league star, entertaining crowds with his prolific scoring. His leaping ability, illustrated by performing slam dunks from the free throw line in slam dunk contests, earned him the nicknames "Air Jordan" and "His Airness". He also gained a reputation for being one of the best defensive players in basketball. In 1991, he won his first NBA championship with the Bulls, and followed that achievement with titles in 1992 and 1993, securing a "three-peat". Although Jordan abruptly retired from basketball at the beginning of the 1993–94 NBA season to pursue a career in baseball, he rejoined the Bulls in 1995 and led them to three additional championships (1996, 1997, and 1998) as well as an NBA-record 72 regular-season wins in the 1995–96 NBA season. Jordan retired for a second time in 1999, but returned for two more NBA seasons from 2001 to 2003 as a member of the Washington Wizards.