28061729 has 2 divisors, whose sum is σ = 28061730. Its totient is φ = 28061728.

The previous prime is 28061717. The next prime is 28061743. The reversal of 28061729 is 92716082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 12061729 = 4000^2 + 3473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28061729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28061749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14030864 + 14030865.

It is an arithmetic number, because the mean of its divisors is an integer number (14030865).

Almost surely, 2^28061729 is an apocalyptic number.

It is an amenable number.

28061729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28061729 is an equidigital number, since it uses as much as digits as its factorization.

28061729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28061729 is about 5297.3322531252. The cubic root of 28061729 is about 303.8818829270.

The spelling of 28061729 in words is "twenty-eight million, sixty-one thousand, seven hundred twenty-nine".