128550220 has 96 divisors (see below), whose sum is σ = 295561728. Its totient is φ = 46835712.

The previous prime is 128550199. The next prime is 128550221. The reversal of 128550220 is 22055821.

It is not an unprimeable number, because it can be changed into a prime (128550221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1325212 + ... + 1325308.

It is an arithmetic number, because the mean of its divisors is an integer number (3078768).

Almost surely, 2^128550220 is an apocalyptic number.

128550220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147780864).

128550220 is an abundant number, since it is smaller than the sum of its proper divisors (167011508).

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

128550220 is a wasteful number, since it uses less digits than its factorization.

128550220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 128550220 is about 11337.9989416122. The cubic root of 128550220 is about 504.6895062239.

The spelling of 128550220 in words is "one hundred twenty-eight million, five hundred fifty thousand, two hundred twenty".