28195729 has 2 divisors, whose sum is σ = 28195730. Its totient is φ = 28195728.

The previous prime is 28195721. The next prime is 28195751. The reversal of 28195729 is 92759182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24275329 + 3920400 = 4927^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 28195729 - 2³ = 28195721 is a prime.

It is not a weakly prime, because it can be changed into another prime (28195721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14097864 + 14097865.

It is an arithmetic number, because the mean of its divisors is an integer number (14097865).

Almost surely, 2^28195729 is an apocalyptic number.

It is an amenable number.

28195729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28195729 is an equidigital number, since it uses as much as digits as its factorization.

28195729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 28195729 is about 5309.9650657985. The cubic root of 28195729 is about 304.3648126405.

The spelling of 28195729 in words is "twenty-eight million, one hundred ninety-five thousand, seven hundred twenty-nine".