228609 has 8 divisors (see below), whose sum is σ = 338720. Its totient is φ = 152388.

The previous prime is 228601. The next prime is 228611. The reversal of 228609 is 906822.

228609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228609 - 2³ = 228601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8467 = 228609 / (2 + 2 + 8 + 6 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 4260.

It is an arithmetic number, because the mean of its divisors is an integer number (42340).

2²²⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

228609 is a deficient number, since it is larger than the sum of its proper divisors (110111).

228609 is an equidigital number, since it uses as much as digits as its factorization.

228609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8476 (or 8470 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 228609 is about 478.1307352597. The cubic root of 228609 is about 61.1454916429.

The spelling of 228609 in words is "two hundred twenty-eight thousand, six hundred nine".