28032169 has 4 divisors (see below), whose sum is σ = 30580560. Its totient is φ = 25483780.

The previous prime is 28032143. The next prime is 28032187. The reversal of 28032169 is 96123082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28032169 - 2⁷ = 28032041 is a prime.

It is a super-2 number, since 2×28032169² = 1571604997689122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28032169.

It is not an unprimeable number, because it can be changed into a prime (28032769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274179 + ... + 1274200.

It is an arithmetic number, because the mean of its divisors is an integer number (7645140).

Almost surely, 2^28032169 is an apocalyptic number.

It is an amenable number.

28032169 is a deficient number, since it is larger than the sum of its proper divisors (2548391).

28032169 is a wasteful number, since it uses less digits than its factorization.

28032169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548390.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28032169 is about 5294.5414343454. The cubic root of 28032169 is about 303.7751431935.

The spelling of 28032169 in words is "twenty-eight million, thirty-two thousand, one hundred sixty-nine".