128812220 has 24 divisors (see below), whose sum is σ = 272235264. Its totient is φ = 51195456.

The previous prime is 128812181. The next prime is 128812237. The reversal of 128812220 is 22218821.

It is a self number, because there is not a number n which added to its sum of digits gives 128812220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17372 + ... + 23651.

It is an arithmetic number, because the mean of its divisors is an integer number (11343136).

Almost surely, 2^128812220 is an apocalyptic number.

128812220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128812220 is an abundant number, since it is smaller than the sum of its proper divisors (143423044).

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

128812220 is a wasteful number, since it uses less digits than its factorization.

128812220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41189 (or 41187 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 128812220 is about 11349.5471275289. The cubic root of 128812220 is about 505.0321451289.

The spelling of 128812220 in words is "one hundred twenty-eight million, eight hundred twelve thousand, two hundred twenty".