28044445 has 32 divisors (see below), whose sum is σ = 40247424. Its totient is φ = 18489600.

The previous prime is 28044433. The next prime is 28044449. The reversal of 28044445 is 54444082.

It is not a de Polignac number, because 28044445 - 2⁵ = 28044413 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28044449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43294 + ... + 43936.

It is an arithmetic number, because the mean of its divisors is an integer number (1257732).

Almost surely, 2^28044445 is an apocalyptic number.

It is an amenable number.

28044445 is a deficient number, since it is larger than the sum of its proper divisors (12202979).

28044445 is a wasteful number, since it uses less digits than its factorization.

28044445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733.

The product of its (nonzero) digits is 20480, while the sum is 31.

The square root of 28044445 is about 5295.7006146496. The cubic root of 28044445 is about 303.8194803433.

The spelling of 28044445 in words is "twenty-eight million, forty-four thousand, four hundred forty-five".