28133277691 has 2 divisors, whose sum is σ = 28133277692. Its totient is φ = 28133277690.

The previous prime is 28133277649. The next prime is 28133277707. The reversal of 28133277691 is 19677233182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28133277691 is a prime.

It is not a weakly prime, because it can be changed into another prime (28133274691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066638845 + 14066638846.

It is an arithmetic number, because the mean of its divisors is an integer number (14066638846).

Almost surely, 2^28133277691 is an apocalyptic number.

28133277691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133277691 is an equidigital number, since it uses as much as digits as its factorization.

28133277691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The spelling of 28133277691 in words is "twenty-eight billion, one hundred thirty-three million, two hundred seventy-seven thousand, six hundred ninety-one".