128678443 has 2 divisors, whose sum is σ = 128678444. Its totient is φ = 128678442.

The previous prime is 128678441. The next prime is 128678447. The reversal of 128678443 is 344876821.

It is a weak prime.

It is an emirp because it is prime and its reverse (344876821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128678443 - 2¹ = 128678441 is a prime.

Together with 128678441, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128678443.

It is not a weakly prime, because it can be changed into another prime (128678441) 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 as a sum of consecutive naturals, namely, 64339221 + 64339222.

It is an arithmetic number, because the mean of its divisors is an integer number (64339222).

Almost surely, 2^128678443 is an apocalyptic number.

128678443 is a deficient number, since it is larger than the sum of its proper divisors (1).

128678443 is an equidigital number, since it uses as much as digits as its factorization.

128678443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 128678443 is about 11343.6521015059. The cubic root of 128678443 is about 504.8572520757.

The spelling of 128678443 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, four hundred forty-three".