128664208 has 40 divisors (see below), whose sum is σ = 262268928. Its totient is φ = 61028352.

The previous prime is 128664199. The next prime is 128664209. The reversal of 128664208 is 802466821.

It is not an unprimeable number, because it can be changed into a prime (128664209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45360 + ... + 48112.

Almost surely, 2^128664208 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 128664208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131134464).

128664208 is an abundant number, since it is smaller than the sum of its proper divisors (133604720).

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

128664208 is a wasteful number, since it uses less digits than its factorization.

128664208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 128664208 is about 11343.0246407208. The cubic root of 128664208 is about 504.8386348470.

The spelling of 128664208 in words is "one hundred twenty-eight million, six hundred sixty-four thousand, two hundred eight".