128109750 has 32 divisors (see below), whose sum is σ = 319763808. Its totient is φ = 34162400.

The previous prime is 128109749. The next prime is 128109769. The reversal of 128109750 is 57901821.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84657 + ... + 86156.

It is an arithmetic number, because the mean of its divisors is an integer number (9992619).

Almost surely, 2^128109750 is an apocalyptic number.

128109750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128109750 is an abundant number, since it is smaller than the sum of its proper divisors (191654058).

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

128109750 is a wasteful number, since it uses less digits than its factorization.

128109750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170833 (or 170823 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 128109750 is about 11318.5577703169. The cubic root of 128109750 is about 504.1124166597.

The spelling of 128109750 in words is "one hundred twenty-eight million, one hundred nine thousand, seven hundred fifty".