128331005 has 16 divisors (see below), whose sum is σ = 168295104. Its totient is φ = 93166080.

The previous prime is 128331001. The next prime is 128331019. The reversal of 128331005 is 500133821.

It is not a de Polignac number, because 128331005 - 2² = 128331001 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 (128331001) 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 15 ways as a sum of consecutive naturals, for example, 35282 + ... + 38748.

It is an arithmetic number, because the mean of its divisors is an integer number (10518444).

Almost surely, 2^128331005 is an apocalyptic number.

It is an amenable number.

128331005 is a deficient number, since it is larger than the sum of its proper divisors (39964099).

128331005 is a wasteful number, since it uses less digits than its factorization.

128331005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 128331005 is about 11328.3275464651. The cubic root of 128331005 is about 504.4024628718.

Adding to 128331005 its reverse (500133821), we get a palindrome (628464826).

It can be divided in two parts, 128 and 331005, that added together give a palindrome (331133).

The spelling of 128331005 in words is "one hundred twenty-eight million, three hundred thirty-one thousand, five".