8 is a composite number, its proper divisors being 1, 2, and 4. It is twice 4 or four times 2. Eight is a power of two, being , and is the first number of the form , p being an integer greater than 1. It has an aliquot sum of 7 in the 4 member aliquot sequence being the first member of 7-aliquot tree. It is symbolized by the Arabic numeral