128322817 has 32 divisors (see below), whose sum is σ = 161568000. Its totient is φ = 101493504.

The previous prime is 128322811. The next prime is 128322829. The reversal of 128322817 is 718223821.

It is not a de Polignac number, because 128322817 - 2³ = 128322809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128322811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343843 + ... + 344215.

It is an arithmetic number, because the mean of its divisors is an integer number (5049000).

Almost surely, 2^128322817 is an apocalyptic number.

128322817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128322817 is a deficient number, since it is larger than the sum of its proper divisors (33245183).

128322817 is an equidigital number, since it uses as much as digits as its factorization.

128322817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 456 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 128322817 is about 11327.9661457827. The cubic root of 128322817 is about 504.3917350533.

The spelling of 128322817 in words is "one hundred twenty-eight million, three hundred twenty-two thousand, eight hundred seventeen".