28204447867 has 4 divisors (see below), whose sum is σ = 28224131400. Its totient is φ = 28184764336.

The previous prime is 28204447861. The next prime is 28204447877. The reversal of 28204447867 is 76874440282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28204447867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28204447861) 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, 9839617 + ... + 9842482.

It is an arithmetic number, because the mean of its divisors is an integer number (7056032850).

Almost surely, 2^28204447867 is an apocalyptic number.

28204447867 is a deficient number, since it is larger than the sum of its proper divisors (19683533).

28204447867 is a wasteful number, since it uses less digits than its factorization.

28204447867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19683532.

The product of its (nonzero) digits is 4816896, while the sum is 52.

The spelling of 28204447867 in words is "twenty-eight billion, two hundred four million, four hundred forty-seven thousand, eight hundred sixty-seven".