28281749 has 2 divisors, whose sum is σ = 28281750. Its totient is φ = 28281748.

The previous prime is 28281739. The next prime is 28281767. The reversal of 28281749 is 94718282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28281124 + 625 = 5318^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 28281749 - 2⁸ = 28281493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28281739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140874 + 14140875.

It is an arithmetic number, because the mean of its divisors is an integer number (14140875).

Almost surely, 2^28281749 is an apocalyptic number.

It is an amenable number.

28281749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281749 is an equidigital number, since it uses as much as digits as its factorization.

28281749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 28281749 is about 5318.0587623681. The cubic root of 28281749 is about 304.6740188241.

The spelling of 28281749 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred forty-nine".