28444445 has 8 divisors (see below), whose sum is σ = 35617536. Its totient is φ = 21766096.

The previous prime is 28444433. The next prime is 28444459. The reversal of 28444445 is 54444482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28444445 - 2⁸ = 28444189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123557 + ... + 123786.

It is an arithmetic number, because the mean of its divisors is an integer number (4452192).

Almost surely, 2^28444445 is an apocalyptic number.

It is an amenable number.

28444445 is a deficient number, since it is larger than the sum of its proper divisors (7173091).

28444445 is a wasteful number, since it uses less digits than its factorization.

28444445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247371.

The product of its digits is 81920, while the sum is 35.

The square root of 28444445 is about 5333.3333854167. Note that the first 4 decimals coincide. The cubic root of 28444445 is about 305.2571333349.

The spelling of 28444445 in words is "twenty-eight million, four hundred forty-four thousand, four hundred forty-five".