228285 has 32 divisors (see below), whose sum is σ = 432000. Its totient is φ = 114048.

The previous prime is 228281. The next prime is 228299. The reversal of 228285 is 582822.

It is not a de Polignac number, because 228285 - 2² = 228281 is a prime.

It is a super-2 number, since 2×228285² = 104228082450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2521 + ... + 2609.

It is an arithmetic number, because the mean of its divisors is an integer number (13500).

2²²⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

228285 is a deficient number, since it is larger than the sum of its proper divisors (203715).

228285 is a wasteful number, since it uses less digits than its factorization.

228285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 116 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 228285 is about 477.7917956600. The cubic root of 228285 is about 61.1165914889.

It can be divided in two parts, 228 and 285, that multiplied together give a triangular number (64980 = T₃₆₀).

The spelling of 228285 in words is "two hundred twenty-eight thousand, two hundred eighty-five".