228040 has 16 divisors (see below), whose sum is σ = 513180. Its totient is φ = 91200.

The previous prime is 228023. The next prime is 228049. The reversal of 228040 is 40822.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 3364 = 474^2 + 58^2 .

It is not an unprimeable number, because it can be changed into a prime (228049) by changing a digit.

228040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2811 + ... + 2890.

2²²⁸⁰⁴⁰ is an apocalyptic number.

228040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228040 is an abundant number, since it is smaller than the sum of its proper divisors (285140).

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

228040 is a wasteful number, since it uses less digits than its factorization.

228040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5712 (or 5708 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 228040 is about 477.5353390064. The cubic root of 228040 is about 61.0947198157.

Adding to 228040 its reverse (40822), we get a palindrome (268862).

The spelling of 228040 in words is "two hundred twenty-eight thousand, forty".