Six is the second smallest composite number, its proper divisors being 1, 2 and 3. Since six equals the sum of these proper divisors, six is a perfect number. The next perfect number is 28. Six is also a highly composite number. The next highly composite number is twelve.
The smallest nonabelian group is the symmetric group S_{3} which has 3! = 6 elements.
A sixsided polygon is a hexagon. A solid with six faces is a hexahedron (of which the cube is a special case).
Six is also:
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