28297844 has 12 divisors (see below), whose sum is σ = 49560000. Its totient is φ = 14137848.

The previous prime is 28297777. The next prime is 28297861. The reversal of 28297844 is 44879282.

It is a junction number, because it is equal to n+sod(n) for n = 28297795 and 28297804.

It is a congruent 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, 6227 + ... + 9765.

It is an arithmetic number, because the mean of its divisors is an integer number (4130000).

Almost surely, 2^28297844 is an apocalyptic number.

It is an amenable number.

28297844 is a deficient number, since it is larger than the sum of its proper divisors (21262156).

28297844 is a wasteful number, since it uses less digits than its factorization.

28297844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542 (or 5540 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 28297844 is about 5319.5717872776. The cubic root of 28297844 is about 304.7318040103.

The spelling of 28297844 in words is "twenty-eight million, two hundred ninety-seven thousand, eight hundred forty-four".