228705 has 16 divisors (see below), whose sum is σ = 372480. Its totient is φ = 119808.

The previous prime is 228677. The next prime is 228707. The reversal of 228705 is 507822.

It is not a de Polignac number, because 228705 - 2⁷ = 228577 is a prime.

It is a Curzon number.

228705 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (228707) 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 15 ways as a sum of consecutive naturals, for example, 1089 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (23280).

2²²⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

228705 is a deficient number, since it is larger than the sum of its proper divisors (143775).

228705 is a wasteful number, since it uses less digits than its factorization.

228705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 228705 is about 478.2311156753. The cubic root of 228705 is about 61.1540494071.

The spelling of 228705 in words is "two hundred twenty-eight thousand, seven hundred five".