128089433 has 4 divisors (see below), whose sum is σ = 132506340. Its totient is φ = 123672528.

The previous prime is 128089417. The next prime is 128089439. The reversal of 128089433 is 334980821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 334980821 = 7 ⋅47854403.

It can be written as a sum of positive squares in 2 ways, for example, as 102252544 + 25836889 = 10112^2 + 5083^2 .

It is a cyclic number.

It is not a de Polignac number, because 128089433 - 2⁴ = 128089417 is a prime.

It is a super-2 number, since 2×128089433² = 32813805692522978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128089439) 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, 2208410 + ... + 2208467.

It is an arithmetic number, because the mean of its divisors is an integer number (33126585).

Almost surely, 2^128089433 is an apocalyptic number.

It is an amenable number.

128089433 is a deficient number, since it is larger than the sum of its proper divisors (4416907).

128089433 is an equidigital number, since it uses as much as digits as its factorization.

128089433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416906.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 128089433 is about 11317.6602263896. The cubic root of 128089433 is about 504.0857660900.

The spelling of 128089433 in words is "one hundred twenty-eight million, eighty-nine thousand, four hundred thirty-three".