Total mass of Albert Einstein's Brain = 1230 gms.
Now, average number of neurons in average man's brain= 86 billion
Weight of average mans brain = 1400 gms
So, number of neurons present in 1 gm of brain = 86 billion/1400= 61428571.42857143
So, Number of Neurons in Albert's Brain = 61428571.42857143 * 1230
That is approximately 75560000000 Neurons.
Hope it helps...! ^_^