28805441447 has 4 divisors (see below), whose sum is σ = 28819824600. Its totient is φ = 28791058296.

The previous prime is 28805441437. The next prime is 28805441479. The reversal of 28805441447 is 74414450882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28805441447 - 2⁸ = 28805441191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805441437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7188572 + ... + 7192577.

It is an arithmetic number, because the mean of its divisors is an integer number (7204956150).

Almost surely, 2^28805441447 is an apocalyptic number.

28805441447 is a deficient number, since it is larger than the sum of its proper divisors (14383153).

28805441447 is a wasteful number, since it uses less digits than its factorization.

28805441447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14383152.

The product of its (nonzero) digits is 1146880, while the sum is 47.

The spelling of 28805441447 in words is "twenty-eight billion, eight hundred five million, four hundred forty-one thousand, four hundred forty-seven".