1328905128 has 16 divisors (see below), whose sum is σ = 3322262880. Its totient is φ = 442968368.

The previous prime is 1328905121. The next prime is 1328905157. The reversal of 1328905128 is 8215098231.

It is not an unprimeable number, because it can be changed into a prime (1328905121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27685500 + ... + 27685547.

It is an arithmetic number, because the mean of its divisors is an integer number (207641430).

Almost surely, 2^1328905128 is an apocalyptic number.

It is an amenable number.

1328905128 is an abundant number, since it is smaller than the sum of its proper divisors (1993357752).

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

1328905128 is a wasteful number, since it uses less digits than its factorization.

1328905128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55371056 (or 55371052 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 1328905128 is about 36454.1510393535. The cubic root of 1328905128 is about 1099.4225972431.

The spelling of 1328905128 in words is "one billion, three hundred twenty-eight million, nine hundred five thousand, one hundred twenty-eight".