128755623 has 8 divisors (see below), whose sum is σ = 172308736. Its totient is φ = 85519800.

The previous prime is 128755591. The next prime is 128755643. The reversal of 128755623 is 326557821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128755623 - 2⁵ = 128755591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128755643) 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 7 ways as a sum of consecutive naturals, for example, 78373 + ... + 79998.

It is an arithmetic number, because the mean of its divisors is an integer number (21538592).

Almost surely, 2^128755623 is an apocalyptic number.

128755623 is a deficient number, since it is larger than the sum of its proper divisors (43553113).

128755623 is a wasteful number, since it uses less digits than its factorization.

128755623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158645.

The product of its digits is 100800, while the sum is 39.

The square root of 128755623 is about 11347.0534941896. The cubic root of 128755623 is about 504.9581679560.

The spelling of 128755623 in words is "one hundred twenty-eight million, seven hundred fifty-five thousand, six hundred twenty-three".