128205297 has 12 divisors (see below), whose sum is σ = 202020624. Its totient is φ = 77700120.

The previous prime is 128205277. The next prime is 128205299. The reversal of 128205297 is 792502821.

128205297 is a `hidden beast` number, since 128 + 2 + 0 + 529 + 7 = 666.

It is not a de Polignac number, because 128205297 - 2¹⁹ = 127681009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128205299) 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 11 ways as a sum of consecutive naturals, for example, 647403 + ... + 647600.

It is an arithmetic number, because the mean of its divisors is an integer number (16835052).

Almost surely, 2^128205297 is an apocalyptic number.

It is an amenable number.

128205297 is a deficient number, since it is larger than the sum of its proper divisors (73815327).

128205297 is a wasteful number, since it uses less digits than its factorization.

128205297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295020 (or 1295017 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 128205297 is about 11322.7777952232. Note that the first 4 decimals coincide. The cubic root of 128205297 is about 504.2377114675.

The spelling of 128205297 in words is "one hundred twenty-eight million, two hundred five thousand, two hundred ninety-seven".