2745
2745 is a natural number that comes after 2744 and before 2746. It is an odd number. The prime factorization is 3^2 × 5 × 61, which makes the number composite. Its positive divisors are 1, 3, 5, 9, 15, 45, 61, 183, 305, 549, 915, and 2745. The digit sum is 18, which indicates divisibility by 9; indeed 2745 = 9 × 305. Because it has more than two divisors, it is not a prime number.
In other numeral systems, 2745 has different representations. In base 10 it is written as 2745; in
Viewed as a calendar year, AD 2745 would fall in the 28th century. In the Gregorian calendar,