Number of the day: 28180

Properties of the number 28180:

28180 = 2² × 5 × 1409 is the 25108^th composite number and is not squarefree.
28180 has 3 distinct prime factors, 12 divisors, 5 antidivisors and 11264 totatives.
28180 has a prime digit sum 19 in base 10.
28180 = 7046² - 7044² = 1414² - 1404² is the difference of 2 nonnegative squares in 2 ways.
28180 is the difference of 2 positive pentagonal numbers in 2 ways.
28180 = 62² + 156² = 44² + 162² is the sum of 2 positive squares in 2 ways.
28180 = 60² + 62² + 144² is the sum of 3 positive squares.
28180² = 14256² + 24308² = 3180² + 28000² = 19344² + 20492² = 16908² + 22544² is the sum of 2 positive squares in 4 ways.
28180² is the sum of 3 positive squares.
28180 is a proper divisor of 1861⁴ - 1.
28180 is palindromic in (at least) base 43.
28180 in base 38 = JJM and consists of only the digits 'J' and 'M'.
28180 in base 42 = Fee and consists of only the digits 'F' and 'e'.
28180 in base 43 = FAF and consists of only the digits 'A' and 'F'.

The number 28180 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A293597: L.g.f.: Sum_{n>=1} (x - x^(2*n-1))^(2*n-1) / (2*n-1).