128644513 has 8 divisors (see below), whose sum is σ = 133293056. Its totient is φ = 124027200.

The previous prime is 128644487. The next prime is 128644531. The reversal of 128644513 is 315446821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128644513 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 745 + ... + 16057.

It is an arithmetic number, because the mean of its divisors is an integer number (16661632).

Almost surely, 2^128644513 is an apocalyptic number.

It is an amenable number.

128644513 is a deficient number, since it is larger than the sum of its proper divisors (4648543).

128644513 is a wasteful number, since it uses less digits than its factorization.

128644513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615.

The product of its digits is 23040, while the sum is 34.

The square root of 128644513 is about 11342.1564528091. The cubic root of 128644513 is about 504.8128744991.

The spelling of 128644513 in words is "one hundred twenty-eight million, six hundred forty-four thousand, five hundred thirteen".