28169065 has 4 divisors (see below), whose sum is σ = 33802884. Its totient is φ = 22535248.

The previous prime is 28169033. The next prime is 28169083. The reversal of 28169065 is 56096182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15968016 + 12201049 = 3996^2 + 3493^2 .

It is a cyclic number.

It is not a de Polignac number, because 28169065 - 2⁵ = 28169033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2816902 + ... + 2816911.

It is an arithmetic number, because the mean of its divisors is an integer number (8450721).

Almost surely, 2^28169065 is an apocalyptic number.

It is an amenable number.

28169065 is a deficient number, since it is larger than the sum of its proper divisors (5633819).

28169065 is an equidigital number, since it uses as much as digits as its factorization.

28169065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633818.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28169065 is about 5307.4537209476. The cubic root of 28169065 is about 304.2688389685.

It can be divided in two parts, 2816 and 9065, that added together give a square (11881 = 109²).

The spelling of 28169065 in words is "twenty-eight million, one hundred sixty-nine thousand, sixty-five".