1. an accountant or any one else who works with numerical data
2. a computer that can solve many problems at a fast rate
The number crunchers work harder than the rest of the company.
One whose primary vocation is dealing with numeric data. Examples of professions that might be referred to as number crunchers are accountant, data processor, statistician, mathemetician, etc.
I'm so glad I'm not a number cruncher like those poor bastards in the statistics division.