28321247647 has 16 divisors (see below), whose sum is σ = 35424652032. Its totient is φ = 21996601920.

The previous prime is 28321247621. The next prime is 28321247651. The reversal of 28321247647 is 74674212382.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321247647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28321247597 and 28321247606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321247347) 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 15 ways as a sum of consecutive naturals, for example, 575398 + ... + 622675.

It is an arithmetic number, because the mean of its divisors is an integer number (2214040752).

Almost surely, 2^28321247647 is an apocalyptic number.

28321247647 is a deficient number, since it is larger than the sum of its proper divisors (7103404385).

28321247647 is a wasteful number, since it uses less digits than its factorization.

28321247647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198398.

The product of its digits is 903168, while the sum is 46.

The spelling of 28321247647 in words is "twenty-eight billion, three hundred twenty-one million, two hundred forty-seven thousand, six hundred forty-seven".