28005000000005 has 12 divisors (see below), whose sum is σ = 39092693877900. Its totient is φ = 19203428571264.

The previous prime is 28004999999989. The next prime is 28005000000007. The reversal of 28005000000005 is 50000000050082.

It can be written as a sum of positive squares in 2 ways, for example, as 16278820228804 + 11726179771201 = 4034702^2 + 3424351^2 .

It is not a de Polignac number, because 28005000000005 - 2⁴ = 28004999999989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005000000007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57153060980 + ... + 57153061469.

It is an arithmetic number, because the mean of its divisors is an integer number (3257724489825).

Almost surely, 2^{28005000000005} is an apocalyptic number.

It is an amenable number.

28005000000005 is a deficient number, since it is larger than the sum of its proper divisors (11087693877895).

28005000000005 is a wasteful number, since it uses less digits than its factorization.

28005000000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114306122468 (or 114306122461 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 28005000000005 its reverse (50000000050082), we get a palindrome (78005000050087).

The spelling of 28005000000005 in words is "twenty-eight trillion, five billion, five", and thus it is an aban number and an uban number.