128809225 has 12 divisors (see below), whose sum is σ = 161277376. Its totient is φ = 102044880.

The previous prime is 128809217. The next prime is 128809231. The reversal of 128809225 is 522908821.

It is not a de Polignac number, because 128809225 - 2³ = 128809217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22437 + ... + 27586.

Almost surely, 2^128809225 is an apocalyptic number.

It is an amenable number.

128809225 is a deficient number, since it is larger than the sum of its proper divisors (32468151).

128809225 is a wasteful number, since it uses less digits than its factorization.

128809225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50136 (or 50131 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 128809225 is about 11349.4151831713. The cubic root of 128809225 is about 505.0282309480.

The spelling of 128809225 in words is "one hundred twenty-eight million, eight hundred nine thousand, two hundred twenty-five".