128889750 has 128 divisors (see below), whose sum is σ = 372003840. Its totient is φ = 29376000.

The previous prime is 128889743. The next prime is 128889751. The reversal of 128889750 is 57988821.

It is a super-2 number, since 2×128889750² = 33225135310125000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128889750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128889751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 139791 + ... + 140709.

It is an arithmetic number, because the mean of its divisors is an integer number (2906280).

Almost surely, 2^128889750 is an apocalyptic number.

128889750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128889750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186001920).

128889750 is an abundant number, since it is smaller than the sum of its proper divisors (243114090).

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

128889750 is a wasteful number, since it uses less digits than its factorization.

128889750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The square root of 128889750 is about 11352.9621685268. The cubic root of 128889750 is about 505.1334483780.

The spelling of 128889750 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, seven hundred fifty".