228565 has 8 divisors (see below), whose sum is σ = 290520. Its totient is φ = 172032.

The previous prime is 228559. The next prime is 228577. The reversal of 228565 is 565822.

It can be written as a sum of positive squares in 4 ways, for example, as 6724 + 221841 = 82^2 + 471^2 .

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

It is a 7-Lehmer number, since φ(228565) divides (228565-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 228565 - 2¹³ = 220373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1260 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (36315).

2²²⁸⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

228565 is a deficient number, since it is larger than the sum of its proper divisors (61955).

228565 is a wasteful number, since it uses less digits than its factorization.

228565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711.

The product of its digits is 4800, while the sum is 28.

The square root of 228565 is about 478.0847205256. The cubic root of 228565 is about 61.1415685336.

The spelling of 228565 in words is "two hundred twenty-eight thousand, five hundred sixty-five".