128404311 has 16 divisors (see below), whose sum is σ = 195861504. Its totient is φ = 73299744.

The previous prime is 128404307. The next prime is 128404313. The reversal of 128404311 is 113404821.

It is not a de Polignac number, because 128404311 - 2² = 128404307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128404313) 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, 23506 + ... + 28448.

It is an arithmetic number, because the mean of its divisors is an integer number (12241344).

Almost surely, 2^128404311 is an apocalyptic number.

128404311 is a deficient number, since it is larger than the sum of its proper divisors (67457193).

128404311 is a wasteful number, since it uses less digits than its factorization.

128404311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 128404311 is about 11331.5626018656. The cubic root of 128404311 is about 504.4984871820.

The spelling of 128404311 in words is "one hundred twenty-eight million, four hundred four thousand, three hundred eleven".