128269235 has 4 divisors (see below), whose sum is σ = 153923088. Its totient is φ = 102615384.

The previous prime is 128269223. The next prime is 128269237. The reversal of 128269235 is 532962821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128269235 - 2¹⁰ = 128268211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128269237) 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 3 ways as a sum of consecutive naturals, for example, 12826919 + ... + 12826928.

It is an arithmetic number, because the mean of its divisors is an integer number (38480772).

Almost surely, 2^128269235 is an apocalyptic number.

128269235 is a deficient number, since it is larger than the sum of its proper divisors (25653853).

128269235 is an equidigital number, since it uses as much as digits as its factorization.

128269235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25653852.

The product of its digits is 51840, while the sum is 38.

The square root of 128269235 is about 11325.6008670622. The cubic root of 128269235 is about 504.3215212983.

The spelling of 128269235 in words is "one hundred twenty-eight million, two hundred sixty-nine thousand, two hundred thirty-five".