Today's number is 4,937,775
A Smith number is a composite number which has the sum of its digits equal to the sum of the digits in its prime factorization.
For example, 85 has the prime factorization 5 * 17. Adding up the digits of 85, we get 8 + 5 = 13. Adding up the digits of the prime factorization, we get 5 + 1 + 7 = 13.
Today's number, 4,937,775, is also a Smith number and is the reason these numbers are called Smith numbers in the first place.
They were named by Albert Wilansky of Lehigh University as he noticed the property in the phone number (493-7775) of his brother-in-law Harold Smith.
The prime factorization of 4937775 = 3 * 5 * 5 * 65837.
Adding up the digits of the number gives 4 + 9 + 3 + 7 + 7 + 7 + 5 = 42
and the prime factorization sum gives 3 + 5 + 5 + 6 + 5 + 8 + 3 + 7 = 42
