28942855877 has 16 divisors (see below), whose sum is σ = 32251549680. Its totient is φ = 25789209600.

The previous prime is 28942855873. The next prime is 28942855883. The reversal of 28942855877 is 77855824982.

It is a Cunningham number, because it is equal to 170126²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 9499621156 + 19443234721 = 97466^2 + 139439^2 .

It is a cyclic number.

It is not a de Polignac number, because 28942855877 - 2² = 28942855873 is a prime.

It is a super-3 number, since 3×28942855877³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28942855873) 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 in 15 ways as a sum of consecutive naturals, for example, 2679227 + ... + 2690007.

It is an arithmetic number, because the mean of its divisors is an integer number (2015721855).

Almost surely, 2^28942855877 is an apocalyptic number.

It is an amenable number.

28942855877 is a deficient number, since it is larger than the sum of its proper divisors (3308693803).

28942855877 is a wasteful number, since it uses less digits than its factorization.

28942855877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17944.

The product of its digits is 90316800, while the sum is 65.

The spelling of 28942855877 in words is "twenty-eight billion, nine hundred forty-two million, eight hundred fifty-five thousand, eight hundred seventy-seven".