128689041 has 16 divisors (see below), whose sum is σ = 185096576. Its totient is φ = 79059456.

The previous prime is 128689039. The next prime is 128689051. The reversal of 128689041 is 140986821.

It is not a de Polignac number, because 128689041 - 2¹ = 128689039 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128689051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23796 + ... + 28698.

It is an arithmetic number, because the mean of its divisors is an integer number (11568536).

Almost surely, 2^128689041 is an apocalyptic number.

It is an amenable number.

128689041 is a deficient number, since it is larger than the sum of its proper divisors (56407535).

128689041 is a wasteful number, since it uses less digits than its factorization.

128689041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 128689041 is about 11344.1192253960. The cubic root of 128689041 is about 504.8711117664.

The spelling of 128689041 in words is "one hundred twenty-eight million, six hundred eighty-nine thousand, forty-one".