28821746717 has 2 divisors, whose sum is σ = 28821746718. Its totient is φ = 28821746716.

The previous prime is 28821746693. The next prime is 28821746731. The reversal of 28821746717 is 71764712882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17325403876 + 11496342841 = 131626^2 + 107221^2 .

It is a cyclic number.

It is not a de Polignac number, because 28821746717 - 2²⁸ = 28553311261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28821746747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410873358 + 14410873359.

It is an arithmetic number, because the mean of its divisors is an integer number (14410873359).

Almost surely, 2^28821746717 is an apocalyptic number.

It is an amenable number.

28821746717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28821746717 is an equidigital number, since it uses as much as digits as its factorization.

28821746717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2107392, while the sum is 53.

The spelling of 28821746717 in words is "twenty-eight billion, eight hundred twenty-one million, seven hundred forty-six thousand, seven hundred seventeen".