228505 has 8 divisors (see below), whose sum is σ = 286272. Its totient is φ = 174768.

The previous prime is 228479. The next prime is 228509. The reversal of 228505 is 505822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228505 - 2⁹ = 227993 is a prime.

It is a Duffinian number.

228505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (228509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879 + ... + 1108.

It is an arithmetic number, because the mean of its divisors is an integer number (35784).

2²²⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

228505 is a deficient number, since it is larger than the sum of its proper divisors (57767).

228505 is a wasteful number, since it uses less digits than its factorization.

228505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 228505 is about 478.0219660225. The cubic root of 228505 is about 61.1362180277.

The spelling of 228505 in words is "two hundred twenty-eight thousand, five hundred five".