128489679556 has 48 divisors (see below), whose sum is σ = 257607933184. Its totient is φ = 54932484096.

The previous prime is 128489679523. The next prime is 128489679557. The reversal of 128489679556 is 655976984821.

It is not an unprimeable number, because it can be changed into a prime (128489679557) 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, 24551116 + ... + 24556348.

Almost surely, 2^128489679556 is an apocalyptic number.

It is an amenable number.

128489679556 is an abundant number, since it is smaller than the sum of its proper divisors (129118253628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128489679556 is a wasteful number, since it uses less digits than its factorization.

128489679556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220 (or 7218 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 70.

The spelling of 128489679556 in words is "one hundred twenty-eight billion, four hundred eighty-nine million, six hundred seventy-nine thousand, five hundred fifty-six".