28716508643 has 2 divisors, whose sum is σ = 28716508644. Its totient is φ = 28716508642.

The previous prime is 28716508637. The next prime is 28716508687. The reversal of 28716508643 is 34680561782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28716508643 - 2⁴ = 28716508627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28716508591 and 28716508600.

It is not a weakly prime, because it can be changed into another prime (28716508603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14358254321 + 14358254322.

It is an arithmetic number, because the mean of its divisors is an integer number (14358254322).

Almost surely, 2^28716508643 is an apocalyptic number.

28716508643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28716508643 is an equidigital number, since it uses as much as digits as its factorization.

28716508643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 28716508643 in words is "twenty-eight billion, seven hundred sixteen million, five hundred eight thousand, six hundred forty-three".