28684017973 has 12 divisors (see below), whose sum is σ = 31899680868. Its totient is φ = 25761939840.

The previous prime is 28684017961. The next prime is 28684017977. The reversal of 28684017973 is 37971048682.

It can be written as a sum of positive squares in 6 ways, for example, as 28976689 + 28655041284 = 5383^2 + 169278^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28684017973 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 (28684017977) 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 11 ways as a sum of consecutive naturals, for example, 2287368 + ... + 2299873.

It is an arithmetic number, because the mean of its divisors is an integer number (2658306739).

Almost surely, 2^28684017973 is an apocalyptic number.

It is an amenable number.

28684017973 is a deficient number, since it is larger than the sum of its proper divisors (3215662895).

28684017973 is a wasteful number, since it uses less digits than its factorization.

28684017973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587304 (or 4587291 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 28684017973 in words is "twenty-eight billion, six hundred eighty-four million, seventeen thousand, nine hundred seventy-three".