128808535 has 4 divisors (see below), whose sum is σ = 154570248. Its totient is φ = 103046824.

The previous prime is 128808527. The next prime is 128808539. The reversal of 128808535 is 535808821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128808535 - 2³ = 128808527 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128808539) 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, 12880849 + ... + 12880858.

It is an arithmetic number, because the mean of its divisors is an integer number (38642562).

Almost surely, 2^128808535 is an apocalyptic number.

128808535 is a deficient number, since it is larger than the sum of its proper divisors (25761713).

128808535 is an equidigital number, since it uses as much as digits as its factorization.

128808535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25761712.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 128808535 is about 11349.3847850886. The cubic root of 128808535 is about 505.0273291749.

The spelling of 128808535 in words is "one hundred twenty-eight million, eight hundred eight thousand, five hundred thirty-five".