Can someone me? ? giving 90 points

Can someone me out here and the tell me the greatest common factor

What numbers are included in the set of integers? what numbers are not included?

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.