28949640893 has 2 divisors, whose sum is σ = 28949640894. Its totient is φ = 28949640892.

The previous prime is 28949640887. The next prime is 28949640911. The reversal of 28949640893 is 39804694982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28798768804 + 150872089 = 169702^2 + 12283^2 .

It is a cyclic number.

It is not a de Polignac number, because 28949640893 - 2⁶ = 28949640829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28949640593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474820446 + 14474820447.

It is an arithmetic number, because the mean of its divisors is an integer number (14474820447).

Almost surely, 2^28949640893 is an apocalyptic number.

It is an amenable number.

28949640893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28949640893 is an equidigital number, since it uses as much as digits as its factorization.

28949640893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 62.

The spelling of 28949640893 in words is "twenty-eight billion, nine hundred forty-nine million, six hundred forty thousand, eight hundred ninety-three".