Let m be the mass of the man standing on earth, the earth’s gravitational force will act on man

This force acting on the man = mg

Where

m = mass of the man

g = acceleration due to gravity on the surface of earth =10 m/s²

Let mass of the man , m = 65 kg.
Then

F = W = mg

= 65 × 10 = 650 N

Which is the force acting on the man
From Newton’s third law of motion, the man is also attracting the earth with a force of 650 N in the opposite direction.