128815896 has 128 divisors (see below), whose sum is σ = 376761600. Its totient is φ = 36288000.

The previous prime is 128815867. The next prime is 128815927. The reversal of 128815896 is 698518821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305766 + ... + 306186.

It is an arithmetic number, because the mean of its divisors is an integer number (2943450).

Almost surely, 2^128815896 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 128815896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188380800).

128815896 is an abundant number, since it is smaller than the sum of its proper divisors (247945704).

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

128815896 is a wasteful number, since it uses less digits than its factorization.

128815896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 517 counting only the distinct ones).

The product of its digits is 276480, while the sum is 48.

The square root of 128815896 is about 11349.7090711613. The cubic root of 128815896 is about 505.0369492293.

The spelling of 128815896 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, eight hundred ninety-six".