128689000 has 64 divisors (see below), whose sum is σ = 328536000. Its totient is φ = 46792000.

The previous prime is 128688983. The next prime is 128689013. The reversal of 128689000 is 986821.

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, 5151 + ... + 16849.

It is an arithmetic number, because the mean of its divisors is an integer number (5133375).

Almost surely, 2^128689000 is an apocalyptic number.

128689000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128689000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164268000).

128689000 is an abundant number, since it is smaller than the sum of its proper divisors (199847000).

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

128689000 is a wasteful number, since it uses less digits than its factorization.

128689000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11731 (or 11717 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 128689000 is about 11344.1174182922. The cubic root of 128689000 is about 504.8710581495.

The spelling of 128689000 in words is "one hundred twenty-eight million, six hundred eighty-nine thousand".