28006808717 has 4 divisors (see below), whose sum is σ = 28007454816. Its totient is φ = 28006162620.

The previous prime is 28006808701. The next prime is 28006808743. The reversal of 28006808717 is 71780860082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71780860082 = 2 ⋅35890430041.

It is a cyclic number.

It is not a de Polignac number, because 28006808717 - 2⁴ = 28006808701 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 (28006808017) 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, 252959 + ... + 346412.

It is an arithmetic number, because the mean of its divisors is an integer number (7001863704).

Almost surely, 2^28006808717 is an apocalyptic number.

It is an amenable number.

28006808717 is a deficient number, since it is larger than the sum of its proper divisors (646099).

28006808717 is an equidigital number, since it uses as much as digits as its factorization.

28006808717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646098.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 28006808717 in words is "twenty-eight billion, six million, eight hundred eight thousand, seven hundred seventeen".