128904073 has 4 divisors (see below), whose sum is σ = 129026628. Its totient is φ = 128781520.

The previous prime is 128904071. The next prime is 128904079. The reversal of 128904073 is 370409821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370409821 = 17 ⋅21788813.

It can be written as a sum of positive squares in 2 ways, for example, as 100260169 + 28643904 = 10013^2 + 5352^2 .

It is a cyclic number.

It is not a de Polignac number, because 128904073 - 2¹ = 128904071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128904071) 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 3 ways as a sum of consecutive naturals, for example, 59686 + ... + 61807.

It is an arithmetic number, because the mean of its divisors is an integer number (32256657).

Almost surely, 2^128904073 is an apocalyptic number.

It is an amenable number.

128904073 is a deficient number, since it is larger than the sum of its proper divisors (122555).

128904073 is a wasteful number, since it uses less digits than its factorization.

128904073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122554.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 128904073 is about 11353.5929555361. The cubic root of 128904073 is about 505.1521588351.

The spelling of 128904073 in words is "one hundred twenty-eight million, nine hundred four thousand, seventy-three".