28011844 has 12 divisors (see below), whose sum is σ = 56023744. Its totient is φ = 12005064.

The previous prime is 28011839. The next prime is 28011847. The reversal of 28011844 is 44811082.

28011844 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1000423 = 28011844 / (2 + 8 + 0 + 1 + 1 + 8 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (28011847) 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, 500184 + ... + 500239.

Almost surely, 2^28011844 is an apocalyptic number.

It is an amenable number.

28011844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28011844 is a wasteful number, since it uses less digits than its factorization.

28011844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000434 (or 1000432 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 28011844 is about 5292.6216566084. The cubic root of 28011844 is about 303.7017070564.

The spelling of 28011844 in words is "twenty-eight million, eleven thousand, eight hundred forty-four".