228533 has 4 divisors (see below), whose sum is σ = 230028. Its totient is φ = 227040.

The previous prime is 228523. The next prime is 228539. The reversal of 228533 is 335822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335822 = 2 ⋅167911.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 18769 = 458^2 + 137^2 .

It is a cyclic number.

It is not a de Polignac number, because 228533 - 2⁴ = 228517 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 228499 and 228508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488 + ... + 833.

It is an arithmetic number, because the mean of its divisors is an integer number (57507).

2²²⁸⁵³³ is an apocalyptic number.

It is an amenable number.

228533 is a deficient number, since it is larger than the sum of its proper divisors (1495).

228533 is a wasteful number, since it uses less digits than its factorization.

228533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494.

The product of its digits is 1440, while the sum is 23.

The square root of 228533 is about 478.0512524824. The cubic root of 228533 is about 61.1387150470.

The spelling of 228533 in words is "two hundred twenty-eight thousand, five hundred thirty-three".