128028443 has 4 divisors (see below), whose sum is σ = 130444128. Its totient is φ = 125612760.

The previous prime is 128028431. The next prime is 128028449. The reversal of 128028443 is 344820821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344820821 = 821 ⋅420001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128028443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128028449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207763 + ... + 1207868.

It is an arithmetic number, because the mean of its divisors is an integer number (32611032).

Almost surely, 2^128028443 is an apocalyptic number.

128028443 is a deficient number, since it is larger than the sum of its proper divisors (2415685).

128028443 is an equidigital number, since it uses as much as digits as its factorization.

128028443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415684.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 128028443 is about 11314.9654440480. The cubic root of 128028443 is about 504.0057462917.

The spelling of 128028443 in words is "one hundred twenty-eight million, twenty-eight thousand, four hundred forty-three".