228508 has 12 divisors (see below), whose sum is σ = 457072. Its totient is φ = 97920.

The previous prime is 228479. The next prime is 228509. The reversal of 228508 is 805822.

228508 is an admirable number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228509) by changing a digit.

228508 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 4053 + ... + 4108.

2²²⁸⁵⁰⁸ is an apocalyptic number.

228508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

228508 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228508 is a wasteful number, since it uses less digits than its factorization.

228508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172 (or 8170 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 228508 is about 478.0251039433. The cubic root of 228508 is about 61.1364855752.

The spelling of 228508 in words is "two hundred twenty-eight thousand, five hundred eight".