28544447 has 8 divisors (see below), whose sum is σ = 29003520. Its totient is φ = 28088280.

The previous prime is 28544443. The next prime is 28544471. The reversal of 28544447 is 74444582.

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

It is a cyclic number.

It is not a de Polignac number, because 28544447 - 2² = 28544443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28544447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28544443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26954 + ... + 27992.

It is an arithmetic number, because the mean of its divisors is an integer number (3625440).

Almost surely, 2^28544447 is an apocalyptic number.

28544447 is a deficient number, since it is larger than the sum of its proper divisors (459073).

28544447 is a wasteful number, since it uses less digits than its factorization.

28544447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its digits is 143360, while the sum is 38.

The square root of 28544447 is about 5342.7003472027. The cubic root of 28544447 is about 305.6144452788.

The spelling of 28544447 in words is "twenty-eight million, five hundred forty-four thousand, four hundred forty-seven".