28120068877 has 2 divisors, whose sum is σ = 28120068878. Its totient is φ = 28120068876.

The previous prime is 28120068869. The next prime is 28120068887. The reversal of 28120068877 is 77886002182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26499281796 + 1620787081 = 162786^2 + 40259^2 .

It is a cyclic number.

It is not a de Polignac number, because 28120068877 - 2³ = 28120068869 is a prime.

It is a super-2 number, since 2×28120068877² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28120068877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28120068887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060034438 + 14060034439.

It is an arithmetic number, because the mean of its divisors is an integer number (14060034439).

Almost surely, 2^28120068877 is an apocalyptic number.

It is an amenable number.

28120068877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28120068877 is an equidigital number, since it uses as much as digits as its factorization.

28120068877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 28120068877 in words is "twenty-eight billion, one hundred twenty million, sixty-eight thousand, eight hundred seventy-seven".