128044509 has 8 divisors (see below), whose sum is σ = 172029792. Its totient is φ = 84711120.

The previous prime is 128044471. The next prime is 128044529. The reversal of 128044509 is 905440821.

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

It is not a de Polignac number, because 128044509 - 2⁸ = 128044253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128044509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128044529) 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 7 ways as a sum of consecutive naturals, for example, 162514 + ... + 163299.

It is an arithmetic number, because the mean of its divisors is an integer number (21503724).

Almost surely, 2^128044509 is an apocalyptic number.

It is an amenable number.

128044509 is a deficient number, since it is larger than the sum of its proper divisors (43985283).

128044509 is a wasteful number, since it uses less digits than its factorization.

128044509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325947.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 128044509 is about 11315.6753664993. The cubic root of 128044509 is about 504.0268275906.

The spelling of 128044509 in words is "one hundred twenty-eight million, forty-four thousand, five hundred nine".