86657729 has 2 divisors, whose sum is σ = 86657730. Its totient is φ = 86657728.

The previous prime is 86657719. The next prime is 86657731. The reversal of 86657729 is 92775668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70174129 + 16483600 = 8377^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 86657729 - 2¹⁶ = 86592193 is a prime.

Together with 86657731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86657719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43328864 + 43328865.

It is an arithmetic number, because the mean of its divisors is an integer number (43328865).

Almost surely, 2^86657729 is an apocalyptic number.

It is an amenable number.

86657729 is a deficient number, since it is larger than the sum of its proper divisors (1).

86657729 is an equidigital number, since it uses as much as digits as its factorization.

86657729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 86657729 is about 9309.0133204331. The cubic root of 86657729 is about 442.5229183657.

The spelling of 86657729 in words is "eighty-six million, six hundred fifty-seven thousand, seven hundred twenty-nine".