128432071 has 4 divisors (see below), whose sum is σ = 129568752. Its totient is φ = 127295392.

The previous prime is 128432063. The next prime is 128432089. The reversal of 128432071 is 170234821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170234821 = 17 ⋅10013813.

It is a cyclic number.

It is not a de Polignac number, because 128432071 - 2³ = 128432063 is a prime.

It is a super-2 number, since 2×128432071² = 32989593722698082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128432011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568171 + ... + 568396.

It is an arithmetic number, because the mean of its divisors is an integer number (32392188).

Almost surely, 2^128432071 is an apocalyptic number.

128432071 is a deficient number, since it is larger than the sum of its proper divisors (1136681).

128432071 is a wasteful number, since it uses less digits than its factorization.

128432071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136680.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 128432071 is about 11332.7874329311. The cubic root of 128432071 is about 504.5348407612.

Adding to 128432071 its reverse (170234821), we get a palindrome (298666892).

The spelling of 128432071 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, seventy-one".