128845917 has 8 divisors (see below), whose sum is σ = 190882880. Its totient is φ = 85897260.

The previous prime is 128845909. The next prime is 128845921. The reversal of 128845917 is 719548821.

It is not a de Polignac number, because 128845917 - 2³ = 128845909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128845987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2386009 + ... + 2386062.

It is an arithmetic number, because the mean of its divisors is an integer number (23860360).

Almost surely, 2^128845917 is an apocalyptic number.

It is an amenable number.

128845917 is a deficient number, since it is larger than the sum of its proper divisors (62036963).

128845917 is an equidigital number, since it uses as much as digits as its factorization.

128845917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772080 (or 4772074 counting only the distinct ones).

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

The square root of 128845917 is about 11351.0315390276. The cubic root of 128845917 is about 505.0761797307.

The spelling of 128845917 in words is "one hundred twenty-eight million, eight hundred forty-five thousand, nine hundred seventeen".