28911065 has 16 divisors (see below), whose sum is σ = 37701120. Its totient is φ = 21202560.

The previous prime is 28911059. The next prime is 28911073. The reversal of 28911065 is 56011982.

It is not a de Polignac number, because 28911065 - 2¹⁰ = 28910041 is a prime.

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, 1964 + ... + 7853.

It is an arithmetic number, because the mean of its divisors is an integer number (2356320).

Almost surely, 2^28911065 is an apocalyptic number.

It is an amenable number.

28911065 is a deficient number, since it is larger than the sum of its proper divisors (8790055).

28911065 is a wasteful number, since it uses less digits than its factorization.

28911065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9872.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 28911065 is about 5376.9010591604. The cubic root of 28911065 is about 306.9172960313.

The spelling of 28911065 in words is "twenty-eight million, nine hundred eleven thousand, sixty-five".