28444028 has 6 divisors (see below), whose sum is σ = 49777056. Its totient is φ = 14222012.

The previous prime is 28444001. The next prime is 28444033. The reversal of 28444028 is 82044482.

It is a junction number, because it is equal to n+sod(n) for n = 28443985 and 28444003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3555500 + ... + 3555507.

It is an arithmetic number, because the mean of its divisors is an integer number (8296176).

Almost surely, 2^28444028 is an apocalyptic number.

It is an amenable number.

28444028 is a deficient number, since it is larger than the sum of its proper divisors (21333028).

28444028 is a wasteful number, since it uses less digits than its factorization.

28444028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111011 (or 7111009 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 28444028 is about 5333.2942915238. The cubic root of 28444028 is about 305.2556416219.

The spelling of 28444028 in words is "twenty-eight million, four hundred forty-four thousand, twenty-eight".