128235623 has 4 divisors (see below), whose sum is σ = 132372288. Its totient is φ = 124098960.

The previous prime is 128235619. The next prime is 128235631. The reversal of 128235623 is 326532821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326532821 = 17 ⋅19207813.

It is a cyclic number.

It is not a de Polignac number, because 128235623 - 2² = 128235619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128235623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128235683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068286 + ... + 2068347.

It is an arithmetic number, because the mean of its divisors is an integer number (33093072).

Almost surely, 2^128235623 is an apocalyptic number.

128235623 is a deficient number, since it is larger than the sum of its proper divisors (4136665).

128235623 is an equidigital number, since it uses as much as digits as its factorization.

128235623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136664.

The product of its digits is 17280, while the sum is 32.

The square root of 128235623 is about 11324.1168750592. The cubic root of 128235623 is about 504.2774662141.

The spelling of 128235623 in words is "one hundred twenty-eight million, two hundred thirty-five thousand, six hundred twenty-three".