228485 has 4 divisors (see below), whose sum is σ = 274188. Its totient is φ = 182784.

The previous prime is 228479. The next prime is 228509. The reversal of 228485 is 584822.

It is a Cunningham number, because it is equal to 478²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 146689 = 286^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 228485 - 2⁴ = 228469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22844 + ... + 22853.

It is an arithmetic number, because the mean of its divisors is an integer number (68547).

2²²⁸⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

228485 is a deficient number, since it is larger than the sum of its proper divisors (45703).

228485 is an equidigital number, since it uses as much as digits as its factorization.

228485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45702.

The product of its digits is 5120, while the sum is 29.

The square root of 228485 is about 478.0010460240. The cubic root of 228485 is about 61.1344343176.

The spelling of 228485 in words is "two hundred twenty-eight thousand, four hundred eighty-five".