128404004 has 12 divisors (see below), whose sum is σ = 224924700. Its totient is φ = 64139808.

The previous prime is 128403991. The next prime is 128404013. The reversal of 128404004 is 400404821.

It can be written as a sum of positive squares in 2 ways, for example, as 102414400 + 25989604 = 10120^2 + 5098^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10739 + ... + 19290.

It is an arithmetic number, because the mean of its divisors is an integer number (18743725).

Almost surely, 2^128404004 is an apocalyptic number.

It is an amenable number.

128404004 is a deficient number, since it is larger than the sum of its proper divisors (96520696).

128404004 is a wasteful number, since it uses less digits than its factorization.

128404004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31102 (or 31100 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 128404004 is about 11331.5490556234. The cubic root of 128404004 is about 504.4980851156.

Adding to 128404004 its reverse (400404821), we get a palindrome (528808825).

The spelling of 128404004 in words is "one hundred twenty-eight million, four hundred four thousand, four".