228645 has 12 divisors (see below), whose sum is σ = 396396. Its totient is φ = 121920.

The previous prime is 228637. The next prime is 228647. The reversal of 228645 is 546822.

It can be written as a sum of positive squares in 2 ways, for example, as 54756 + 173889 = 234^2 + 417^2 .

It is not a de Polignac number, because 228645 - 2³ = 228637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228647) 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 11 ways as a sum of consecutive naturals, for example, 2496 + ... + 2585.

It is an arithmetic number, because the mean of its divisors is an integer number (33033).

2²²⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

228645 is a deficient number, since it is larger than the sum of its proper divisors (167751).

228645 is a wasteful number, since it uses less digits than its factorization.

228645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092 (or 5089 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 228645 is about 478.1683803850. The cubic root of 228645 is about 61.1487010852.

The spelling of 228645 in words is "two hundred twenty-eight thousand, six hundred forty-five".