128781545 has 16 divisors (see below), whose sum is σ = 164021760. Its totient is φ = 96731904.

The previous prime is 128781509. The next prime is 128781589. The reversal of 128781545 is 545187821.

It is not a de Polignac number, because 128781545 - 2⁶ = 128781481 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39134 + ... + 42296.

It is an arithmetic number, because the mean of its divisors is an integer number (10251360).

Almost surely, 2^128781545 is an apocalyptic number.

It is an amenable number.

128781545 is a deficient number, since it is larger than the sum of its proper divisors (35240215).

128781545 is a wasteful number, since it uses less digits than its factorization.

128781545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664.

The product of its digits is 89600, while the sum is 41.

The square root of 128781545 is about 11348.1956715594. The cubic root of 128781545 is about 504.9920529416.

The spelling of 128781545 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, five hundred forty-five".