128581285 has 16 divisors (see below), whose sum is σ = 186713856. Its totient is φ = 82983168.

The previous prime is 128581261. The next prime is 128581291. The reversal of 128581285 is 582185821.

It is a cyclic number.

It is not a de Polignac number, because 128581285 - 2¹¹ = 128579237 is a prime.

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, 107457 + ... + 108646.

It is an arithmetic number, because the mean of its divisors is an integer number (11669616).

Almost surely, 2^128581285 is an apocalyptic number.

It is an amenable number.

128581285 is a deficient number, since it is larger than the sum of its proper divisors (58132571).

128581285 is a wasteful number, since it uses less digits than its factorization.

128581285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216132.

The product of its digits is 51200, while the sum is 40.

The square root of 128581285 is about 11339.3688095943. The cubic root of 128581285 is about 504.7301567877.

The spelling of 128581285 in words is "one hundred twenty-eight million, five hundred eighty-one thousand, two hundred eighty-five".