Divided by 10, there is still 4, which means that the single digit is 4.

Divided into 9 parts, there are 3 left, that is, after removing 3 parts, when the unit number is 1, it is a multiple of 9.

When the unit number is 1, the number that is a multiple of 9 is 90x+8 1(x is an integer).

Divide it into eight, and there are two left. When x=3,

270+8 1+3=354 satisfies the condition (352 is divisible by 8).

So there are 354 pieces of sugar.