28005844 has 12 divisors (see below), whose sum is σ = 49265524. Its totient is φ = 13929984.

The previous prime is 28005841. The next prime is 28005847. The reversal of 28005844 is 44850082.

It is an interprime number because it is at equal distance from previous prime (28005841) and next prime (28005847).

It can be written as a sum of positive squares in 2 ways, for example, as 15132100 + 12873744 = 3890^2 + 3588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005841) 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, 17367 + ... + 18910.

Almost surely, 2^28005844 is an apocalyptic number.

It is an amenable number.

28005844 is a deficient number, since it is larger than the sum of its proper divisors (21259680).

28005844 is a wasteful number, since it uses less digits than its factorization.

28005844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36474 (or 36472 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28005844 is about 5292.0547994139. The cubic root of 28005844 is about 303.6800217012.

The spelling of 28005844 in words is "twenty-eight million, five thousand, eight hundred forty-four".