28216169 has 4 divisors (see below), whose sum is σ = 29126400. Its totient is φ = 27305940.

The previous prime is 28216157. The next prime is 28216183. The reversal of 28216169 is 96161282.

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 28216169 - 2²⁴ = 11438953 is a prime.

It is a super-2 number, since 2×28216169² = 1592304386073122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28216369) 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, 455069 + ... + 455130.

It is an arithmetic number, because the mean of its divisors is an integer number (7281600).

Almost surely, 2^28216169 is an apocalyptic number.

It is an amenable number.

28216169 is a deficient number, since it is larger than the sum of its proper divisors (910231).

28216169 is an equidigital number, since it uses as much as digits as its factorization.

28216169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910230.

The product of its digits is 10368, while the sum is 35.

The square root of 28216169 is about 5311.8894002040. The cubic root of 28216169 is about 304.4383428556.

The spelling of 28216169 in words is "twenty-eight million, two hundred sixteen thousand, one hundred sixty-nine".