128897589 has 32 divisors (see below), whose sum is σ = 184633344. Its totient is φ = 79808960.

The previous prime is 128897557. The next prime is 128897611. The reversal of 128897589 is 985798821.

It is a cyclic number.

It is not a de Polignac number, because 128897589 - 2⁵ = 128897557 is a prime.

It is a super-2 number, since 2×128897589² = 33229176900025842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128817589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406459 + ... + 406775.

It is an arithmetic number, because the mean of its divisors is an integer number (5769792).

Almost surely, 2^128897589 is an apocalyptic number.

It is an amenable number.

128897589 is a deficient number, since it is larger than the sum of its proper divisors (55735755).

128897589 is a wasteful number, since it uses less digits than its factorization.

128897589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its digits is 2903040, while the sum is 57.

The square root of 128897589 is about 11353.3074035719. The cubic root of 128897589 is about 505.1436888117.

The spelling of 128897589 in words is "one hundred twenty-eight million, eight hundred ninety-seven thousand, five hundred eighty-nine".