128068209 has 20 divisors (see below), whose sum is σ = 199632576. Its totient is φ = 81665496.

The previous prime is 128068201. The next prime is 128068247. The reversal of 128068209 is 902860821.

It is not a de Polignac number, because 128068209 - 2³ = 128068201 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (128068201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32509 + ... + 36234.

Almost surely, 2^128068209 is an apocalyptic number.

It is an amenable number.

128068209 is a deficient number, since it is larger than the sum of its proper divisors (71564367).

128068209 is an equidigital number, since it uses as much as digits as its factorization.

128068209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68778 (or 68769 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 128068209 is about 11316.7225379082. The cubic root of 128068209 is about 504.0579227647.

The spelling of 128068209 in words is "one hundred twenty-eight million, sixty-eight thousand, two hundred nine".