128755220 has 24 divisors (see below), whose sum is σ = 294967008. Its totient is φ = 46820000.

The previous prime is 128755217. The next prime is 128755223. The reversal of 128755220 is 22557821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128755217) and next prime (128755223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128755223) 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 7 ways as a sum of consecutive naturals, for example, 292406 + ... + 292845.

It is an arithmetic number, because the mean of its divisors is an integer number (12290292).

Almost surely, 2^128755220 is an apocalyptic number.

128755220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128755220 is an abundant number, since it is smaller than the sum of its proper divisors (166211788).

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

128755220 is a wasteful number, since it uses less digits than its factorization.

128755220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585271 (or 585269 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 128755220 is about 11347.0357362617. The cubic root of 128755220 is about 504.9576411224.

The spelling of 128755220 in words is "one hundred twenty-eight million, seven hundred fifty-five thousand, two hundred twenty".