28071899677 has 2 divisors, whose sum is σ = 28071899678. Its totient is φ = 28071899676.

The previous prime is 28071899627. The next prime is 28071899693. The reversal of 28071899677 is 77699817082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25249527801 + 2822371876 = 158901^2 + 53126^2 .

It is a cyclic number.

It is not a de Polignac number, because 28071899677 - 2⁷ = 28071899549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28071899617) 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, 14035949838 + 14035949839.

It is an arithmetic number, because the mean of its divisors is an integer number (14035949839).

Almost surely, 2^28071899677 is an apocalyptic number.

It is an amenable number.

28071899677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28071899677 is an equidigital number, since it uses as much as digits as its factorization.

28071899677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 64.

The spelling of 28071899677 in words is "twenty-eight billion, seventy-one million, eight hundred ninety-nine thousand, six hundred seventy-seven".