128780808 has 64 divisors (see below), whose sum is σ = 350965440. Its totient is φ = 39139584.

The previous prime is 128780801. The next prime is 128780837. The reversal of 128780808 is 808087821.

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 128780808.

It is not an unprimeable number, because it can be changed into a prime (128780801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23410 + ... + 28382.

It is an arithmetic number, because the mean of its divisors is an integer number (5483835).

Almost surely, 2^128780808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128780808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175482720).

128780808 is an abundant number, since it is smaller than the sum of its proper divisors (222184632).

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

128780808 is a wasteful number, since it uses less digits than its factorization.

128780808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078 (or 5074 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 128780808 is about 11348.1631993905. The cubic root of 128780808 is about 504.9910896052.

The spelling of 128780808 in words is "one hundred twenty-eight million, seven hundred eighty thousand, eight hundred eight".