228840 has 32 divisors (see below), whose sum is σ = 686880. Its totient is φ = 60992.

The previous prime is 228829. The next prime is 228841. The reversal of 228840 is 48822.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 228840.

It is not an unprimeable number, because it can be changed into a prime (228841) by changing a digit.

228840 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 7 ways as a sum of consecutive naturals, for example, 834 + ... + 1073.

It is an arithmetic number, because the mean of its divisors is an integer number (21465).

2²²⁸⁸⁴⁰ is an apocalyptic number.

228840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228840 is an abundant number, since it is smaller than the sum of its proper divisors (458040).

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

228840 is a wasteful number, since it uses less digits than its factorization.

228840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1917 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 228840 is about 478.3722399973. The cubic root of 228840 is about 61.1660797122.

The spelling of 228840 in words is "two hundred twenty-eight thousand, eight hundred forty".