128220 has 24 divisors (see below), whose sum is σ = 359184. Its totient is φ = 34176.

The previous prime is 128213. The next prime is 128221. The reversal of 128220 is 22821.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 128220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128221) by changing a digit.

128220 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 7 ways as a sum of consecutive naturals, for example, 1009 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (14966).

2¹²⁸²²⁰ is an apocalyptic number.

128220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128220 is an abundant number, since it is smaller than the sum of its proper divisors (230964).

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

128220 is a wasteful number, since it uses less digits than its factorization.

128220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149 (or 2147 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 128220 is about 358.0782037488. The cubic root of 128220 is about 50.4256986604.

The spelling of 128220 in words is "one hundred twenty-eight thousand, two hundred twenty".