8687729 has 2 divisors, whose sum is σ = 8687730. Its totient is φ = 8687728.

The previous prime is 8687713. The next prime is 8687759. The reversal of 8687729 is 9277868.

8687729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 277729 = 2900^2 + 527^2 .

It is a cyclic number.

It is not a de Polignac number, because 8687729 - 2⁴ = 8687713 is a prime.

It is not a weakly prime, because it can be changed into another prime (8687759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343864 + 4343865.

It is an arithmetic number, because the mean of its divisors is an integer number (4343865).

Almost surely, 2^8687729 is an apocalyptic number.

It is an amenable number.

8687729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8687729 is an equidigital number, since it uses as much as digits as its factorization.

8687729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 8687729 is about 2947.4953774349. The cubic root of 8687729 is about 205.5742692267.

The spelling of 8687729 in words is "eight million, six hundred eighty-seven thousand, seven hundred twenty-nine".