28911085 has 16 divisors (see below), whose sum is σ = 39747456. Its totient is φ = 19775808.

The previous prime is 28911073. The next prime is 28911089. The reversal of 28911085 is 58011982.

It is a cyclic number.

It is not a de Polignac number, because 28911085 - 2⁹ = 28910573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28911085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18754 + ... + 20236.

It is an arithmetic number, because the mean of its divisors is an integer number (2484216).

Almost surely, 2^28911085 is an apocalyptic number.

It is an amenable number.

28911085 is a deficient number, since it is larger than the sum of its proper divisors (10836371).

28911085 is a wasteful number, since it uses less digits than its factorization.

28911085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 28911085 is about 5376.9029189674. The cubic root of 28911085 is about 306.9173668041.

The spelling of 28911085 in words is "twenty-eight million, nine hundred eleven thousand, eighty-five".