228865 has 16 divisors (see below), whose sum is σ = 338688. Its totient is φ = 144576.

The previous prime is 228859. The next prime is 228869. The reversal of 228865 is 568822.

228865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 228865 - 2⁷ = 228737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

It is a Proth number, since it is equal to 447 ⋅ 2⁹ + 1 and 447 < 2⁹.

2²²⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

228865 is a deficient number, since it is larger than the sum of its proper divisors (109823).

228865 is a wasteful number, since it uses less digits than its factorization.

228865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 7680, while the sum is 31.

The square root of 228865 is about 478.3983695624. The cubic root of 228865 is about 61.1683070272.

The spelling of 228865 in words is "two hundred twenty-eight thousand, eight hundred sixty-five".