28393304447 has 4 divisors (see below), whose sum is σ = 28394375856. Its totient is φ = 28392233040.

The previous prime is 28393304419. The next prime is 28393304507. The reversal of 28393304447 is 74440339382.

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 28393304447 - 2⁶ = 28393304383 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 (28393304047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494918 + ... + 549299.

It is an arithmetic number, because the mean of its divisors is an integer number (7098593964).

Almost surely, 2^28393304447 is an apocalyptic number.

28393304447 is a deficient number, since it is larger than the sum of its proper divisors (1071409).

28393304447 is a wasteful number, since it uses less digits than its factorization.

28393304447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071408.

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 28393304447 in words is "twenty-eight billion, three hundred ninety-three million, three hundred four thousand, four hundred forty-seven".