150

150 is an integer. It is even and composite, with prime factorization 2 × 3 × 5^2. Its positive divisors are 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, and 150. The digit-sum of 150 is 6, making it a Harshad (Niven) number in base 10. In mathematics, 150 is an abundant number: the sum of its proper divisors (1 + 2 + 3 + 5 + 6 + 10 + 15 + 25 + 30 + 50 + 75) equals 222, which exceeds 150.

Representations: in Roman numerals 150 is CL. In binary, 150 is 10010110; in hexadecimal, 0x96.

Uses and appearances: 150 is used as a round figure in measurements; 150 cm equals 1.5 meters. It can appear as a distance or quantity in everyday contexts, such as 150 kilometers. The 150th day of a common year falls on May 30; in a leap year it falls on May 29. The astronomical unit, about 149.6 million kilometers, is often rounded to 150 million kilometers for rough educational purposes.

Historical and cultural notes: the number is sometimes used to denote milestones, such as a 150-year anniversary or year 150 in a calendar era. As a round, easily memorable figure, 150 appears in education, statistics, and everyday counting, serving primarily as a convenient benchmark rather than a value with inherent meaning beyond its arithmetic properties.