28001844 has 36 divisors (see below), whose sum is σ = 76228516. Its totient is φ = 8615808.

The previous prime is 28001837. The next prime is 28001881. The reversal of 28001844 is 44810082.

It can be written as a sum of positive squares in 2 ways, for example, as 16305444 + 11696400 = 4038^2 + 3420^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29449 + ... + 30384.

Almost surely, 2^28001844 is an apocalyptic number.

It is an amenable number.

28001844 is an abundant number, since it is smaller than the sum of its proper divisors (48226672).

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

28001844 is a wasteful number, since it uses less digits than its factorization.

28001844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59856 (or 59851 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28001844 is about 5291.6768608826. The cubic root of 28001844 is about 303.6655630770.

The spelling of 28001844 in words is "twenty-eight million, one thousand, eight hundred forty-four".