128781588 has 48 divisors (see below), whose sum is σ = 324779840. Its totient is φ = 39481344.

The previous prime is 128781509. The next prime is 128781589. The reversal of 128781588 is 885187821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128781589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46548 + ... + 49236.

Almost surely, 2^128781588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128781588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162389920).

128781588 is an abundant number, since it is smaller than the sum of its proper divisors (195998252).

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

128781588 is a wasteful number, since it uses less digits than its factorization.

128781588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016 (or 3014 counting only the distinct ones).

The product of its digits is 286720, while the sum is 48.

The square root of 128781588 is about 11348.1975661336. The cubic root of 128781588 is about 504.9921091470.

The spelling of 128781588 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, five hundred eighty-eight".