129228 has 36 divisors (see below), whose sum is σ = 335160. Its totient is φ = 38720.

The previous prime is 129223. The next prime is 129229. The reversal of 129228 is 822921.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 129198 and 129207.

It is not an unprimeable number, because it can be changed into a prime (129221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1408 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (9310).

2¹²⁹²²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167580).

129228 is an abundant number, since it is smaller than the sum of its proper divisors (205932).

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

129228 is a wasteful number, since it uses less digits than its factorization.

129228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 105 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 129228 is about 359.4829620441. The cubic root of 129228 is about 50.5574942344.

The spelling of 129228 in words is "one hundred twenty-nine thousand, two hundred twenty-eight".