228540 has 48 divisors (see below), whose sum is σ = 691488. Its totient is φ = 56064.

The previous prime is 228539. The next prime is 228559. The reversal of 228540 is 45822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (14406).

2²²⁸⁵⁴⁰ is an apocalyptic number.

228540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345744).

228540 is an abundant number, since it is smaller than the sum of its proper divisors (462948).

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

228540 is a wasteful number, since it uses less digits than its factorization.

228540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 228540 is about 478.0585738171. The cubic root of 228540 is about 61.1393392700.

The spelling of 228540 in words is "two hundred twenty-eight thousand, five hundred forty".