28199169 has 12 divisors (see below), whose sum is σ = 40904292. Its totient is φ = 18720000.

The previous prime is 28199159. The next prime is 28199177. The reversal of 28199169 is 96199182.

It can be written as a sum of positive squares in 2 ways, for example, as 8485569 + 19713600 = 2913^2 + 4440^2 .

It is not a de Polignac number, because 28199169 - 2⁴ = 28199153 is a prime.

It is a super-2 number, since 2×28199169² = 1590386264581122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28199159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4332 + ... + 8669.

It is an arithmetic number, because the mean of its divisors is an integer number (3408691).

Almost surely, 2^28199169 is an apocalyptic number.

It is an amenable number.

28199169 is a deficient number, since it is larger than the sum of its proper divisors (12705123).

28199169 is a wasteful number, since it uses less digits than its factorization.

28199169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13248 (or 13245 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 28199169 is about 5310.2889751877. The cubic root of 28199169 is about 304.3771900751.

The spelling of 28199169 in words is "twenty-eight million, one hundred ninety-nine thousand, one hundred sixty-nine".