Search a number
-
+
285285 = 357111319
BaseRepresentation
bin1000101101001100101
3112111100010
41011221211
533112120
610040433
72265510
oct1055145
9474303
10285285
11185380
12119119
139cb10
1475d77
15597e0
hex45a65

285285 has 64 divisors (see below), whose sum is σ = 645120. Its totient is φ = 103680.

The previous prime is 285283. The next prime is 285287. The reversal of 285285 is 582582.

It is an interprime number because it is at equal distance from previous prime (285283) and next prime (285287).

It is not a de Polignac number, because 285285 - 21 = 285283 is a prime.

285285 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15006 + ... + 15024.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2285285 is an apocalyptic number.

It is an amenable number.

285285 is an abundant number, since it is smaller than the sum of its proper divisors (359835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285285 is a wasteful number, since it uses less digits than its factorization.

285285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58.

The product of its digits is 6400, while the sum is 30.

The square root of 285285 is about 534.1207728595. The cubic root of 285285 is about 65.8303724923.

The spelling of 285285 in words is "two hundred eighty-five thousand, two hundred eighty-five".

Divisors: 1 3 5 7 11 13 15 19 21 33 35 39 55 57 65 77 91 95 105 133 143 165 195 209 231 247 273 285 385 399 429 455 627 665 715 741 1001 1045 1155 1235 1365 1463 1729 1995 2145 2717 3003 3135 3705 4389 5005 5187 7315 8151 8645 13585 15015 19019 21945 25935 40755 57057 95095 285285