128945817 has 96 divisors (see below), whose sum is σ = 258600960. Its totient is φ = 61663680.

The previous prime is 128945743. The next prime is 128945821. The reversal of 128945817 is 718549821.

It is not a de Polignac number, because 128945817 - 2¹² = 128941721 is a prime.

Its product of digits (161280) is a multiple of the sum of its prime factors (420).

It is not an unprimeable number, because it can be changed into a prime (128945417) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 351168 + ... + 351534.

It is an arithmetic number, because the mean of its divisors is an integer number (2693760).

Almost surely, 2^128945817 is an apocalyptic number.

It is an amenable number.

128945817 is an abundant number, since it is smaller than the sum of its proper divisors (129655143).

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

128945817 is a wasteful number, since it uses less digits than its factorization.

128945817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 401 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 128945817 is about 11355.4311675075. The cubic root of 128945817 is about 505.2066820563.

The spelling of 128945817 in words is "one hundred twenty-eight million, nine hundred forty-five thousand, eight hundred seventeen".