1328989128 has 64 divisors (see below), whose sum is σ = 3482144640. Its totient is φ = 421876224.

The previous prime is 1328989117. The next prime is 1328989139. The reversal of 1328989128 is 8219898231.

It is an interprime number because it is at equal distance from previous prime (1328989117) and next prime (1328989139).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123450 + ... + 133782.

It is an arithmetic number, because the mean of its divisors is an integer number (54408510).

Almost surely, 2^1328989128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1328989128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1741072320).

1328989128 is an abundant number, since it is smaller than the sum of its proper divisors (2153155512).

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

1328989128 is a wasteful number, since it uses less digits than its factorization.

1328989128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10598 (or 10594 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 1328989128 is about 36455.3031533136. The cubic root of 1328989128 is about 1099.4457615635.

The spelling of 1328989128 in words is "one billion, three hundred twenty-eight million, nine hundred eighty-nine thousand, one hundred twenty-eight".