28271729 has 2 divisors, whose sum is σ = 28271730. Its totient is φ = 28271728.

The previous prime is 28271699. The next prime is 28271741. The reversal of 28271729 is 92717282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 6630625 = 4652^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 28271729 - 2²⁰ = 27223153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28271692 and 28271701.

It is not a weakly prime, because it can be changed into another prime (28271779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14135864 + 14135865.

It is an arithmetic number, because the mean of its divisors is an integer number (14135865).

Almost surely, 2^28271729 is an apocalyptic number.

It is an amenable number.

28271729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28271729 is an equidigital number, since it uses as much as digits as its factorization.

28271729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 28271729 is about 5317.1166058306. The cubic root of 28271729 is about 304.6380333755.

The spelling of 28271729 in words is "twenty-eight million, two hundred seventy-one thousand, seven hundred twenty-nine".