285 is the natural number following 284 and preceding 286.
In mathematics 285 is an odd composite number. 285 is the 9th square pyramidal number. That means it is the sum of a number of consecutive perfect squares starting with 1. For 285, it is the sum of all of the single digits' perfect squares. 285 is the number of variations possible with a binary rooted tree with 13 points. A binary rooted tree means that it always begins with 1 point that is rooted. From there, each point can branch in up to two directions. 285 is a sphenic number which means that it has three distinct prime factors. 285 is a Harshad number. That means that it is divisible by the sum of its digits. 285 is divisible by 15. 285 is a repdigit number in base 7. In base 7, 285 is 555. 285 is a very symmetric number. If flipped horizontally, these numbers are symmetrical.
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