128956285 has 16 divisors (see below), whose sum is σ = 165845376. Its totient is φ = 96009408.

The previous prime is 128956273. The next prime is 128956291. The reversal of 128956285 is 582659821.

It is a cyclic number.

It is not a de Polignac number, because 128956285 - 2⁵ = 128956253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10899 + ... + 19408.

It is an arithmetic number, because the mean of its divisors is an integer number (10365336).

Almost surely, 2^128956285 is an apocalyptic number.

It is an amenable number.

128956285 is a deficient number, since it is larger than the sum of its proper divisors (36889091).

128956285 is a wasteful number, since it uses less digits than its factorization.

128956285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30372.

The product of its digits is 345600, while the sum is 46.

The square root of 128956285 is about 11355.8920829673. The cubic root of 128956285 is about 505.2203528124.

The spelling of 128956285 in words is "one hundred twenty-eight million, nine hundred fifty-six thousand, two hundred eighty-five".