128259870 has 16 divisors (see below), whose sum is σ = 307823760. Its totient is φ = 34202624.

The previous prime is 128259869. The next prime is 128259877. The reversal of 128259870 is 78952821.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128259877) 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, 2137635 + ... + 2137694.

It is an arithmetic number, because the mean of its divisors is an integer number (19238985).

Almost surely, 2^128259870 is an apocalyptic number.

128259870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128259870 is an abundant number, since it is smaller than the sum of its proper divisors (179563890).

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

128259870 is a wasteful number, since it uses less digits than its factorization.

128259870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275339.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 128259870 is about 11325.1874156678. The cubic root of 128259870 is about 504.3092474121.

The spelling of 128259870 in words is "one hundred twenty-eight million, two hundred fifty-nine thousand, eight hundred seventy".