28121044 has 12 divisors (see below), whose sum is σ = 56242144. Its totient is φ = 12051864.

The previous prime is 28121033. The next prime is 28121047. The reversal of 28121044 is 44012182.

28121044 is an admirable number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121047) 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, 502134 + ... + 502189.

Almost surely, 2^28121044 is an apocalyptic number.

It is an amenable number.

28121044 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.

28121044 is a wasteful number, since it uses less digits than its factorization.

28121044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004334 (or 1004332 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28121044 is about 5302.9278705259. The cubic root of 28121044 is about 304.0958406265.

The spelling of 28121044 in words is "twenty-eight million, one hundred twenty-one thousand, forty-four".