128211808 has 24 divisors (see below), whose sum is σ = 259241472. Its totient is φ = 62372736.

The previous prime is 128211749. The next prime is 128211827. The reversal of 128211808 is 808112821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128211808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52960 + ... + 55327.

It is an arithmetic number, because the mean of its divisors is an integer number (10801728).

Almost surely, 2^128211808 is an apocalyptic number.

It is an amenable number.

128211808 is an abundant number, since it is smaller than the sum of its proper divisors (131029664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128211808 is a wasteful number, since it uses less digits than its factorization.

128211808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108334 (or 108326 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 128211808 is about 11323.0653093586. The cubic root of 128211808 is about 504.2462473503.

The spelling of 128211808 in words is "one hundred twenty-eight million, two hundred eleven thousand, eight hundred eight".