135228 has 24 divisors (see below), whose sum is σ = 322560. Its totient is φ = 44080.
The previous prime is 135221. The next prime is 135241. The reversal of 135228 is 822531.
It is a super-2 number, since 2×1352282 = 36573223968, which contains 22 as substring.
It is a nialpdrome in base 12.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (135221) by changing a digit.
135228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613 + ... + 803.
It is an arithmetic number, because the mean of its divisors is an integer number (13440).
2135228 is an apocalyptic number.
It is an amenable number.
135228 is an abundant number, since it is smaller than the sum of its proper divisors (187332).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
135228 is a wasteful number, since it uses less digits than its factorization.
135228 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 257 (or 255 counting only the distinct ones).
The product of its digits is 480, while the sum is 21.
The square root of 135228 is about 367.7335992264. The cubic root of 135228 is about 51.3281417512.
Adding to 135228 its reverse (822531), we get a palindrome (957759).
It can be divided in two parts, 13522 and 8, that added together give a triangular number (13530 = T164).
The spelling of 135228 in words is "one hundred thirty-five thousand, two hundred twenty-eight".
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