28647702691 has 2 divisors, whose sum is σ = 28647702692. Its totient is φ = 28647702690.

The previous prime is 28647702679. The next prime is 28647702761. The reversal of 28647702691 is 19620774682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28647702691 - 2¹¹ = 28647700643 is a prime.

It is not a weakly prime, because it can be changed into another prime (28647702641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323851345 + 14323851346.

It is an arithmetic number, because the mean of its divisors is an integer number (14323851346).

Almost surely, 2^28647702691 is an apocalyptic number.

28647702691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28647702691 is an equidigital number, since it uses as much as digits as its factorization.

28647702691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 28647702691 in words is "twenty-eight billion, six hundred forty-seven million, seven hundred two thousand, six hundred ninety-one".