128403679 has 2 divisors, whose sum is σ = 128403680. Its totient is φ = 128403678.

The previous prime is 128403659. The next prime is 128403721. The reversal of 128403679 is 976304821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128403679 - 2¹¹ = 128401631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128403629) 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, 64201839 + 64201840.

It is an arithmetic number, because the mean of its divisors is an integer number (64201840).

Almost surely, 2^128403679 is an apocalyptic number.

128403679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128403679 is an equidigital number, since it uses as much as digits as its factorization.

128403679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 128403679 is about 11331.5347151213. The cubic root of 128403679 is about 504.4976594747.

The spelling of 128403679 in words is "one hundred twenty-eight million, four hundred three thousand, six hundred seventy-nine".