28357543691 has 2 divisors, whose sum is σ = 28357543692. Its totient is φ = 28357543690.

The previous prime is 28357543649. The next prime is 28357543693. The reversal of 28357543691 is 19634575382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28357543691 - 2¹⁴ = 28357527307 is a prime.

Together with 28357543693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28357543693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178771845 + 14178771846.

It is an arithmetic number, because the mean of its divisors is an integer number (14178771846).

Almost surely, 2^28357543691 is an apocalyptic number.

28357543691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357543691 is an equidigital number, since it uses as much as digits as its factorization.

28357543691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 53.

The spelling of 28357543691 in words is "twenty-eight billion, three hundred fifty-seven million, five hundred forty-three thousand, six hundred ninety-one".