228689 has 8 divisors (see below), whose sum is σ = 244032. Its totient is φ = 213840.

The previous prime is 228677. The next prime is 228707. The reversal of 228689 is 986822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228689 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (228619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (30504).

2²²⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

228689 is a deficient number, since it is larger than the sum of its proper divisors (15343).

228689 is a wasteful number, since it uses less digits than its factorization.

228689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247.

The product of its digits is 13824, while the sum is 35.

The square root of 228689 is about 478.2143870692. The cubic root of 228689 is about 61.1526232794.

The spelling of 228689 in words is "two hundred twenty-eight thousand, six hundred eighty-nine".