28389165 has 32 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 12892224.

The previous prime is 28389161. The next prime is 28389209. The reversal of 28389165 is 56198382.

It is not a de Polignac number, because 28389165 - 2² = 28389161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28389161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16726 + ... + 18344.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^28389165 is an apocalyptic number.

It is an amenable number.

28389165 is a deficient number, since it is larger than the sum of its proper divisors (23865555).

28389165 is a wasteful number, since it uses less digits than its factorization.

28389165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its digits is 103680, while the sum is 42.

The square root of 28389165 is about 5328.1483650514. The cubic root of 28389165 is about 305.0592557091.

The spelling of 28389165 in words is "twenty-eight million, three hundred eighty-nine thousand, one hundred sixty-five".