128598489 has 32 divisors (see below), whose sum is σ = 202487040. Its totient is φ = 80384256.

The previous prime is 128598469. The next prime is 128598493. The reversal of 128598489 is 984895821.

128598489 is a `hidden beast` number, since 1 + 2 + 8 + 598 + 48 + 9 = 666.

It is not a de Polignac number, because 128598489 - 2¹¹ = 128596441 is a prime.

Its product of digits (1658880) is a multiple of the sum of its prime divisors (1080).

It is not an unprimeable number, because it can be changed into a prime (128598469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230599 + ... + 231155.

It is an arithmetic number, because the mean of its divisors is an integer number (6327720).

Almost surely, 2^128598489 is an apocalyptic number.

It is an amenable number.

128598489 is a deficient number, since it is larger than the sum of its proper divisors (73888551).

128598489 is a wasteful number, since it uses less digits than its factorization.

128598489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1080 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 128598489 is about 11340.1273802370. The cubic root of 128598489 is about 504.7526665186.

The spelling of 128598489 in words is "one hundred twenty-eight million, five hundred ninety-eight thousand, four hundred eighty-nine".