28111065 has 16 divisors (see below), whose sum is σ = 45085248. Its totient is φ = 14956736.

The previous prime is 28111049. The next prime is 28111067. The reversal of 28111065 is 56011182.

It is a cyclic number.

It is not a de Polignac number, because 28111065 - 2⁴ = 28111049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28111067) 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, 4999 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (2817828).

Almost surely, 2^28111065 is an apocalyptic number.

It is an amenable number.

28111065 is a deficient number, since it is larger than the sum of its proper divisors (16974183).

28111065 is a wasteful number, since it uses less digits than its factorization.

28111065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 28111065 is about 5301.9868917228. The cubic root of 28111065 is about 304.0598660089.

The spelling of 28111065 in words is "twenty-eight million, one hundred eleven thousand, sixty-five".