28768732991 has 2 divisors, whose sum is σ = 28768732992. Its totient is φ = 28768732990.

The previous prime is 28768732939. The next prime is 28768732997. The reversal of 28768732991 is 19923786782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28768732991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28768732997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14384366495 + 14384366496.

It is an arithmetic number, because the mean of its divisors is an integer number (14384366496).

Almost surely, 2^28768732991 is an apocalyptic number.

28768732991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28768732991 is an equidigital number, since it uses as much as digits as its factorization.

28768732991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 62.

The spelling of 28768732991 in words is "twenty-eight billion, seven hundred sixty-eight million, seven hundred thirty-two thousand, nine hundred ninety-one".