128459840 has 56 divisors (see below), whose sum is σ = 307406040. Its totient is φ = 51130368.

The previous prime is 128459833. The next prime is 128459843. The reversal of 128459840 is 48954821.

It can be written as a sum of positive squares in 4 ways, for example, as 9388096 + 119071744 = 3064^2 + 10912^2 .

It is not an unprimeable number, because it can be changed into a prime (128459843) 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, 72404 + ... + 74156.

Almost surely, 2^128459840 is an apocalyptic number.

128459840 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 128459840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153703020).

128459840 is an abundant number, since it is smaller than the sum of its proper divisors (178946200).

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

128459840 is a wasteful number, since it uses less digits than its factorization.

128459840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1989 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 128459840 is about 11334.0125286679. The cubic root of 128459840 is about 504.5712008859.

The spelling of 128459840 in words is "one hundred twenty-eight million, four hundred fifty-nine thousand, eight hundred forty".