128109120 has 56 divisors (see below), whose sum is σ = 406749504. Its totient is φ = 34162176.

The previous prime is 128109061. The next prime is 128109139. The reversal of 128109120 is 21901821.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable 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, 65764 + ... + 67683.

It is an arithmetic number, because the mean of its divisors is an integer number (7263384).

Almost surely, 2^128109120 is an apocalyptic number.

128109120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128109120 is an abundant number, since it is smaller than the sum of its proper divisors (278640384).

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

128109120 is a wasteful number, since it uses less digits than its factorization.

128109120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133467 (or 133457 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 128109120 is about 11318.5299398818. The cubic root of 128109120 is about 504.1115903074. Note that the first 3 decimals are identical.

The spelling of 128109120 in words is "one hundred twenty-eight million, one hundred nine thousand, one hundred twenty".