28286729 has 2 divisors, whose sum is σ = 28286730. Its totient is φ = 28286728.

The previous prime is 28286719. The next prime is 28286747. The reversal of 28286729 is 92768282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 11868025 = 4052^2 + 3445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28286729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28286729.

It is not a weakly prime, because it can be changed into another prime (28286719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14143364 + 14143365.

It is an arithmetic number, because the mean of its divisors is an integer number (14143365).

Almost surely, 2^28286729 is an apocalyptic number.

It is an amenable number.

28286729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28286729 is an equidigital number, since it uses as much as digits as its factorization.

28286729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 28286729 is about 5318.5269577205. The cubic root of 28286729 is about 304.6919006456.

The spelling of 28286729 in words is "twenty-eight million, two hundred eighty-six thousand, seven hundred twenty-nine".