Number of the day: 90220

Richard Dedekind was born on this day 185 years ago.

Properties of the number 90220:

90220 = 2² × 5 × 13 × 347 is the 81481^th composite number and is not squarefree.
90220 has 4 distinct prime factors, 24 divisors, 27 antidivisors and 33216 totatives.
90220 has an emirp digit sum 13 in base 10.
90220 has a Fibonacci digit sum 13 in base 10.
90220 = 22556² - 22554² = 4516² - 4506² = 1748² - 1722² = 412² - 282² is the difference of 2 nonnegative squares in 4 ways.
90220 is the sum of 2 positive triangular numbers.
90220 is the difference of 2 positive pentagonal numbers in 3 ways.
90220 = 34² + 150² + 258² is the sum of 3 positive squares.
90220² = 54132² + 72176² = 22208² + 87444² = 45804² + 77728² = 34700² + 83280² is the sum of 2 positive squares in 4 ways.
90220² is the sum of 3 positive squares.
90220 is a divisor of 79³⁴⁶ - 1.
90220 is palindromic in (at least) the following bases: 3, 93, and -97.