128257808 has 60 divisors (see below), whose sum is σ = 290284992. Its totient is φ = 53766720.

The previous prime is 128257699. The next prime is 128257817. The reversal of 128257808 is 808752821.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1009841 + ... + 1009967.

Almost surely, 2^128257808 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 128257808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145142496).

128257808 is an abundant number, since it is smaller than the sum of its proper divisors (162027184).

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

128257808 is an equidigital number, since it uses as much as digits as its factorization.

128257808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 128257808 is about 11325.0963792808. The cubic root of 128257808 is about 504.3065448488.

The spelling of 128257808 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, eight hundred eight".