128388897 has 48 divisors (see below), whose sum is σ = 232202880. Its totient is φ = 66548736.

The previous prime is 128388889. The next prime is 128388899. The reversal of 128388897 is 798883821.

It is not a de Polignac number, because 128388897 - 2³ = 128388889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128388899) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46993 + ... + 49649.

It is an arithmetic number, because the mean of its divisors is an integer number (4837560).

Almost surely, 2^128388897 is an apocalyptic number.

It is an amenable number.

128388897 is a deficient number, since it is larger than the sum of its proper divisors (103813983).

128388897 is a wasteful number, since it uses less digits than its factorization.

128388897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2739 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 128388897 is about 11330.8824457762. The cubic root of 128388897 is about 504.4782992542.

The spelling of 128388897 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, eight hundred ninety-seven".