A storybook has 128 pages, each page has 25 lines, and each line has 28 characters. How many characters are there in this storybook?
一本故事书共128页，每页有25行，每行28个字，这本故事书共有多少个字？
<gadget id="calculator">28 * 25 * 128</gadget>
<output>89_600</output>

<result>89_600</result>