128830872 has 32 divisors (see below), whose sum is σ = 322375680. Its totient is φ = 42903840.

The previous prime is 128830861. The next prime is 128830873. The reversal of 128830872 is 278038821.

It is a self number, because there is not a number n which added to its sum of digits gives 128830872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128830873) 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, 36297 + ... + 39687.

It is an arithmetic number, because the mean of its divisors is an integer number (10074240).

Almost surely, 2^128830872 is an apocalyptic number.

128830872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128830872 is an abundant number, since it is smaller than the sum of its proper divisors (193544808).

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

128830872 is a wasteful number, since it uses less digits than its factorization.

128830872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983 (or 4979 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 128830872 is about 11350.3688045808. The cubic root of 128830872 is about 505.0565201583.

The spelling of 128830872 in words is "one hundred twenty-eight million, eight hundred thirty thousand, eight hundred seventy-two".