28071844 has 12 divisors (see below), whose sum is σ = 49164444. Its totient is φ = 14024864.

The previous prime is 28071809. The next prime is 28071847. The reversal of 28071844 is 44817082.

It can be written as a sum of positive squares in 2 ways, for example, as 4665600 + 23406244 = 2160^2 + 4838^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071847) 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 3 ways as a sum of consecutive naturals, for example, 6114 + ... + 9670.

It is an arithmetic number, because the mean of its divisors is an integer number (4097037).

Almost surely, 2^28071844 is an apocalyptic number.

It is an amenable number.

28071844 is a deficient number, since it is larger than the sum of its proper divisors (21092600).

28071844 is a wasteful number, since it uses less digits than its factorization.

28071844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5534 (or 5532 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 28071844 is about 5298.2868929495. The cubic root of 28071844 is about 303.9183904898.

The spelling of 28071844 in words is "twenty-eight million, seventy-one thousand, eight hundred forty-four".