128404233 has 12 divisors (see below), whose sum is σ = 186547140. Its totient is φ = 85106976.

The previous prime is 128404219. The next prime is 128404249. The reversal of 128404233 is 332404821.

128404233 is a `hidden beast` number, since 1 + 28 + 404 + 233 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 123943689 + 4460544 = 11133^2 + 2112^2 .

It is not a de Polignac number, because 128404233 - 2⁹ = 128403721 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128404197 and 128404206.

It is not an unprimeable number, because it can be changed into a prime (128406233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39678 + ... + 42791.

It is an arithmetic number, because the mean of its divisors is an integer number (15545595).

Almost surely, 2^128404233 is an apocalyptic number.

It is an amenable number.

128404233 is a deficient number, since it is larger than the sum of its proper divisors (58142907).

128404233 is a wasteful number, since it uses less digits than its factorization.

128404233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82648 (or 82645 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 128404233 is about 11331.5591601509. The cubic root of 128404233 is about 504.4983850284.

The spelling of 128404233 in words is "one hundred twenty-eight million, four hundred four thousand, two hundred thirty-three".