128587109 has 8 divisors (see below), whose sum is σ = 147330048. Its totient is φ = 109937520.

The previous prime is 128587097. The next prime is 128587127. The reversal of 128587109 is 901785821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128587109 - 2²⁰ = 127538533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128587139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20357 + ... + 25914.

It is an arithmetic number, because the mean of its divisors is an integer number (18416256).

Almost surely, 2^128587109 is an apocalyptic number.

It is an amenable number.

128587109 is a deficient number, since it is larger than the sum of its proper divisors (18742939).

128587109 is an equidigital number, since it uses as much as digits as its factorization.

128587109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46675.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 128587109 is about 11339.6256111037. The cubic root of 128587109 is about 504.7377771400.

The spelling of 128587109 in words is "one hundred twenty-eight million, five hundred eighty-seven thousand, one hundred nine".