28044297 has 6 divisors (see below), whose sum is σ = 40508442. Its totient is φ = 18696192.

The previous prime is 28044277. The next prime is 28044301. The reversal of 28044297 is 79244082.

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 3154176 = 4989^2 + 1776^2 .

It is not a de Polignac number, because 28044297 - 2¹⁰ = 28043273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28044217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1558008 + ... + 1558025.

It is an arithmetic number, because the mean of its divisors is an integer number (6751407).

Almost surely, 2^28044297 is an apocalyptic number.

It is an amenable number.

28044297 is a deficient number, since it is larger than the sum of its proper divisors (12464145).

28044297 is a wasteful number, since it uses less digits than its factorization.

28044297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116039 (or 3116036 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28044297 is about 5295.6866410315. The cubic root of 28044297 is about 303.8189458897.

The spelling of 28044297 in words is "twenty-eight million, forty-four thousand, two hundred ninety-seven".