28212167677 has 2 divisors, whose sum is σ = 28212167678. Its totient is φ = 28212167676.

The previous prime is 28212167657. The next prime is 28212167771. The reversal of 28212167677 is 77676121282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25322675161 + 2889492516 = 159131^2 + 53754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28212167677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28212167677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28212167657) 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, 14106083838 + 14106083839.

It is an arithmetic number, because the mean of its divisors is an integer number (14106083839).

Almost surely, 2^28212167677 is an apocalyptic number.

It is an amenable number.

28212167677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28212167677 is an equidigital number, since it uses as much as digits as its factorization.

28212167677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 49.

The spelling of 28212167677 in words is "twenty-eight billion, two hundred twelve million, one hundred sixty-seven thousand, six hundred seventy-seven".