128875440 has 160 divisors (see below), whose sum is σ = 428829696. Its totient is φ = 31933440.

The previous prime is 128875421. The next prime is 128875447. The reversal of 128875440 is 44578821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (128875447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203925 + ... + 204555.

Almost surely, 2^128875440 is an apocalyptic number.

128875440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128875440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214414848).

128875440 is an abundant number, since it is smaller than the sum of its proper divisors (299954256).

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

128875440 is a wasteful number, since it uses less digits than its factorization.

128875440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The square root of 128875440 is about 11352.3319190376. The cubic root of 128875440 is about 505.1147535188.

The spelling of 128875440 in words is "one hundred twenty-eight million, eight hundred seventy-five thousand, four hundred forty".