Number of the day: 58220

Ernst Eduard Kummer was born on this day 211 years ago.

Properties of the number 58220:

58220 = 2² × 5 × 41 × 71 is the 52322^th composite number and is not squarefree.
58220 has 4 distinct prime factors, 24 divisors, 19 antidivisors and 22400 totatives.
58220 has an emirp digit sum 17 in base 10.
58220 = 14556² - 14554² = 2916² - 2906² = 396² - 314² = 276² - 134² is the difference of 2 nonnegative squares in 4 ways.
58220 is the difference of 2 positive pentagonal numbers in 4 ways.
58220 = 26² + 30² + 238² is the sum of 3 positive squares.
58220² = 34932² + 46576² = 23856² + 53108² = 37772² + 44304² = 12780² + 56800² is the sum of 2 positive squares in 4 ways.
58220² is the sum of 3 positive squares.
58220 is a proper divisor of 409¹⁰ - 1.
58220 is palindromic in (at least) the following bases: 68, and 84.
58220 in base 58 = HHk and consists of only the digits 'H' and 'k'.

The number 58220 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A232967: Irregular triangle read by rows: row n lists the rank sizes of the "electrical" poset EP_n of circular planar graphs with n boundary vertices.