660990

660990 is a natural number that follows 660989 and precedes 660991. In the decimal system, it is written as six hundred sixty thousand nine hundred ninety. It is an even, composite integer.

Its prime factorization is 2 × 3 × 5 × 11 × 2003, a product of five distinct primes. This factorization implies that 660990 has 32 positive divisors. Examples of divisors include 1, 2, 3, 5, 6, 10, 11, 15, 22, 30, 33, 55, 66, 110, 165, 330, 2003, 4006, 6009, 10015, 22033, 44066, 60090, 66099, 110165, 132198, 220330, 330495, and 660990, among others.

The sum of all divisors of 660990, denoted sigma(n), equals (1+2)(1+3)(1+5)(1+11)(1+2003) = 1,731,456. Therefore the sum of proper divisors is 1,070,466, which exceeds the number itself, making 660990 an abundant number.

In base 10, 660990 is also a Harshad (or Niven) number, since it is divisible by the sum of its digits (6+6+0+9+9+0 = 30), and 660990 ÷ 30 = 22033 is an integer. The decimal representation features two zeros and repeated digits in its pattern, reflecting its composition from multiple small primes.