128910870 has 96 divisors (see below), whose sum is σ = 372003840. Its totient is φ = 30707520.

The previous prime is 128910863. The next prime is 128910889. The reversal of 128910870 is 78019821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57307 + ... + 59513.

It is an arithmetic number, because the mean of its divisors is an integer number (3875040).

Almost surely, 2^128910870 is an apocalyptic number.

128910870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128910870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186001920).

128910870 is an abundant number, since it is smaller than the sum of its proper divisors (243092970).

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

128910870 is a wasteful number, since it uses less digits than its factorization.

128910870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290 (or 2287 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 128910870 is about 11353.8922841464. The cubic root of 128910870 is about 505.1610374241.

The spelling of 128910870 in words is "one hundred twenty-eight million, nine hundred ten thousand, eight hundred seventy".