128440085280 has 96 divisors (see below), whose sum is σ = 435708310464. Its totient is φ = 31616019456.

The previous prime is 128440085273. The next prime is 128440085353. The reversal of 128440085280 is 82580044821.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10285434 + ... + 10297913.

It is an arithmetic number, because the mean of its divisors is an integer number (4538628234).

Almost surely, 2^128440085280 is an apocalyptic number.

128440085280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128440085280 is an abundant number, since it is smaller than the sum of its proper divisors (307268225184).

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

128440085280 is a wasteful number, since it uses less digits than its factorization.

128440085280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20583378 (or 20583370 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 42.

The spelling of 128440085280 in words is "one hundred twenty-eight billion, four hundred forty million, eighty-five thousand, two hundred eighty".