28133565 has 16 divisors (see below), whose sum is σ = 45315456. Its totient is φ = 14904000.

The previous prime is 28133563. The next prime is 28133569. The reversal of 28133565 is 56533182.

It is not a de Polignac number, because 28133565 - 2¹ = 28133563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133561) 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, 3946 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (2832216).

Almost surely, 2^28133565 is an apocalyptic number.

It is an amenable number.

28133565 is a deficient number, since it is larger than the sum of its proper divisors (17181891).

28133565 is a wasteful number, since it uses less digits than its factorization.

28133565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580.

The product of its digits is 21600, while the sum is 33.

The square root of 28133565 is about 5304.1083133737. The cubic root of 28133565 is about 304.1409671996.

The spelling of 28133565 in words is "twenty-eight million, one hundred thirty-three thousand, five hundred sixty-five".