128905265 has 8 divisors (see below), whose sum is σ = 157308480. Its totient is φ = 101376112.

The previous prime is 128905229. The next prime is 128905267. The reversal of 128905265 is 562509821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128905265 - 2⁸ = 128905009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128905267) 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, 218189 + ... + 218778.

It is an arithmetic number, because the mean of its divisors is an integer number (19663560).

Almost surely, 2^128905265 is an apocalyptic number.

It is an amenable number.

128905265 is a deficient number, since it is larger than the sum of its proper divisors (28403215).

128905265 is an equidigital number, since it uses as much as digits as its factorization.

128905265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437031.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 128905265 is about 11353.6454498104. The cubic root of 128905265 is about 505.1537159090.

The spelling of 128905265 in words is "one hundred twenty-eight million, nine hundred five thousand, two hundred sixty-five".