228205 has 4 divisors (see below), whose sum is σ = 273852. Its totient is φ = 182560.

The previous prime is 228203. The next prime is 228211. The reversal of 228205 is 502822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94249 + 133956 = 307^2 + 366^2 .

It is not a de Polignac number, because 228205 - 2¹ = 228203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22816 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (68463).

2²²⁸²⁰⁵ is an apocalyptic number.

It is an amenable number.

228205 is a deficient number, since it is larger than the sum of its proper divisors (45647).

228205 is an equidigital number, since it uses as much as digits as its factorization.

228205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45646.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 228205 is about 477.7080698502. The cubic root of 228205 is about 61.1094514395.

The spelling of 228205 in words is "two hundred twenty-eight thousand, two hundred five".