128644523 has 16 divisors (see below), whose sum is σ = 152223744. Its totient is φ = 106414560.

The previous prime is 128644487. The next prime is 128644531. The reversal of 128644523 is 325446821.

It is a de Polignac number, because none of the positive numbers 2^k-128644523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128644583) 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, 30938 + ... + 34848.

It is an arithmetic number, because the mean of its divisors is an integer number (9513984).

Almost surely, 2^128644523 is an apocalyptic number.

128644523 is a deficient number, since it is larger than the sum of its proper divisors (23579221).

128644523 is a wasteful number, since it uses less digits than its factorization.

128644523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082.

The product of its digits is 46080, while the sum is 35.

The square root of 128644523 is about 11342.1568936424. The cubic root of 128644523 is about 504.8128875794.

The spelling of 128644523 in words is "one hundred twenty-eight million, six hundred forty-four thousand, five hundred twenty-three".