128009233 has 16 divisors (see below), whose sum is σ = 143979264. Its totient is φ = 112786560.

The previous prime is 128009207. The next prime is 128009239. The reversal of 128009233 is 332900821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128009233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128009239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148941 + ... + 149797.

It is an arithmetic number, because the mean of its divisors is an integer number (8998704).

Almost surely, 2^128009233 is an apocalyptic number.

It is an amenable number.

128009233 is a deficient number, since it is larger than the sum of its proper divisors (15970031).

128009233 is a wasteful number, since it uses less digits than its factorization.

128009233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 128009233 is about 11314.1165364336. The cubic root of 128009233 is about 503.9805372198.

The spelling of 128009233 in words is "one hundred twenty-eight million, nine thousand, two hundred thirty-three".