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sum of digits of the erased number

Source: 2020 Dürer Math Competition Finals Day2 E3 https://artofproblemsolving.com/community/c1622639_2020_

January 7, 2022

number theorysum of digits

Problem Statement

Ann wrote down all the perfect squares from one to one million (all in a single line). However, at night, an evil elf erased one of the numbers. So the next day, Ann saw an empty space between the numbers

760384

and

763876

. What is the sum of the digits of the erased number?

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