128547280 has 20 divisors (see below), whose sum is σ = 298872612. Its totient is φ = 51418880.

The previous prime is 128547271. The next prime is 128547281. The reversal of 128547280 is 82745821.

It can be written as a sum of positive squares in 2 ways, for example, as 23853456 + 104693824 = 4884^2 + 10232^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128547281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 803341 + ... + 803500.

Almost surely, 2^128547280 is an apocalyptic number.

128547280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128547280 is an abundant number, since it is smaller than the sum of its proper divisors (170325332).

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

128547280 is a wasteful number, since it uses less digits than its factorization.

128547280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606854 (or 1606848 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 128547280 is about 11337.8692883628. The cubic root of 128547280 is about 504.6856587043.

The spelling of 128547280 in words is "one hundred twenty-eight million, five hundred forty-seven thousand, two hundred eighty".