128970889 has 8 divisors (see below), whose sum is σ = 134462592. Its totient is φ = 123592560.

The previous prime is 128970887. The next prime is 128970901. The reversal of 128970889 is 988079821.

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

It is a cyclic number.

It is not a de Polignac number, because 128970889 - 2¹ = 128970887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128970887) 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, 26017 + ... + 30574.

It is an arithmetic number, because the mean of its divisors is an integer number (16807824).

Almost surely, 2^128970889 is an apocalyptic number.

It is an amenable number.

128970889 is a deficient number, since it is larger than the sum of its proper divisors (5491703).

128970889 is an equidigital number, since it uses as much as digits as its factorization.

128970889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56687.

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 128970889 is about 11356.5350789755. The cubic root of 128970889 is about 505.2394237700.

The spelling of 128970889 in words is "one hundred twenty-eight million, nine hundred seventy thousand, eight hundred eighty-nine".