# 72720130561

$t_title is "72720130561"

$t_adjust_path is "/~caldwell/curios/"

$t_class is "composite"

$nunber_id is "5317"

$t_meta['description'] is "One of many pages of prime number
curiosities and trivia. This page discusses 72720130561
Come explore a new prime today!"

`7 2720130561`

72720130561 = 13 * 23 * 29 * 41 * 43 * 67 * 71. This is the smallest 7-brilliant Carmichael number. Note that the sum of these prime factors is 13 + 23 + 29 + 41 + 43 + 67 + 71 = 287 = 7 * 41, so the mean of the 7 prime factors equals the median prime factor: 41. Note also that the next consecutive Carmichael Number is a 3-brilliant number: 72725349421 = 1693 * 5077 * 8461. [Carmichael]

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