128789040 has 40 divisors (see below), whose sum is σ = 399246768. Its totient is φ = 34343680.

The previous prime is 128789033. The next prime is 128789041. The reversal of 128789040 is 40987821.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 128789040.

It is not an unprimeable number, because it can be changed into a prime (128789041) 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 7 ways as a sum of consecutive naturals, for example, 268071 + ... + 268550.

Almost surely, 2^128789040 is an apocalyptic number.

128789040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128789040 is an abundant number, since it is smaller than the sum of its proper divisors (270457728).

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

128789040 is a wasteful number, since it uses less digits than its factorization.

128789040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536637 (or 536631 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 128789040 is about 11348.5258954633. The cubic root of 128789040 is about 505.0018494851.

The spelling of 128789040 in words is "one hundred twenty-eight million, seven hundred eighty-nine thousand, forty".