28132729 has 2 divisors, whose sum is σ = 28132730. Its totient is φ = 28132728.

The previous prime is 28132721. The next prime is 28132751. The reversal of 28132729 is 92723182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 12766329 = 3920^2 + 3573^2 .

It is a cyclic number.

It is not a de Polignac number, because 28132729 - 2³ = 28132721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28132694 and 28132703.

It is not a weakly prime, because it can be changed into another prime (28132721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066364 + 14066365.

It is an arithmetic number, because the mean of its divisors is an integer number (14066365).

Almost surely, 2^28132729 is an apocalyptic number.

It is an amenable number.

28132729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28132729 is an equidigital number, since it uses as much as digits as its factorization.

28132729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 28132729 is about 5304.0295059511. The cubic root of 28132729 is about 304.1379546134.

The spelling of 28132729 in words is "twenty-eight million, one hundred thirty-two thousand, seven hundred twenty-nine".