28318181729 has 2 divisors, whose sum is σ = 28318181730. Its totient is φ = 28318181728.

The previous prime is 28318181701. The next prime is 28318181767. The reversal of 28318181729 is 92718181382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28313110225 + 5071504 = 168265^2 + 2252^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28318181729 is a prime.

It is not a weakly prime, because it can be changed into another prime (28318181329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14159090864 + 14159090865.

It is an arithmetic number, because the mean of its divisors is an integer number (14159090865).

Almost surely, 2^28318181729 is an apocalyptic number.

It is an amenable number.

28318181729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28318181729 is an equidigital number, since it uses as much as digits as its factorization.

28318181729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 50.

The spelling of 28318181729 in words is "twenty-eight billion, three hundred eighteen million, one hundred eighty-one thousand, seven hundred twenty-nine".