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perfect number
noun
a positive number that is equal to the sum of all positive integers that are submultiples of it, as 6, which is equal to the sum of 1, 2, and 3.
perfect number
noun
an integer, such as 28, that is equal to the sum of all its possible factors, excluding itself
perfect number
A positive integer that equals the sum of all of its divisors other than itself. An example is 28, whose divisors (not counting itself) are 1, 2, 4, 7, and 14, which added together give 28.
51Թ History and Origins
Origin of perfect number1
Example Sentences
Soil experts differ on the perfect number between acidity and alkalinity, but the sweet spot is generally believed to be between 6.5 and 7.2, Wallace said, and some scientists believe plants in SoCal can tolerate alkalinity as high as 7.9.
“There is no perfect number to send, no perfect geography to send it out to,” Galperin said.
"Without the scientific study, it can’t be said what will be the perfect number for Mount Everest," he said.
Still, Pi is not a perfect number.
“It’s one of those days, every shot you hit just has a perfect number,” An said.
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