28207166389 has 2 divisors, whose sum is σ = 28207166390. Its totient is φ = 28207166388.

The previous prime is 28207166311. The next prime is 28207166423. The reversal of 28207166389 is 98366170282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27702939364 + 504227025 = 166442^2 + 22455^2 .

It is a cyclic number.

It is not a de Polignac number, because 28207166389 - 2⁷ = 28207166261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28207166089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103583194 + 14103583195.

It is an arithmetic number, because the mean of its divisors is an integer number (14103583195).

Almost surely, 2^28207166389 is an apocalyptic number.

It is an amenable number.

28207166389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207166389 is an equidigital number, since it uses as much as digits as its factorization.

28207166389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 28207166389 in words is "twenty-eight billion, two hundred seven million, one hundred sixty-six thousand, three hundred eighty-nine".