87566729 has 2 divisors, whose sum is σ = 87566730. Its totient is φ = 87566728.

The previous prime is 87566719. The next prime is 87566741. The reversal of 87566729 is 92766578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 2096704 = 9245^2 + 1448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87566729 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87566719) 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, 43783364 + 43783365.

It is an arithmetic number, because the mean of its divisors is an integer number (43783365).

Almost surely, 2^87566729 is an apocalyptic number.

It is an amenable number.

87566729 is a deficient number, since it is larger than the sum of its proper divisors (1).

87566729 is an equidigital number, since it uses as much as digits as its factorization.

87566729 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 87566729 is about 9357.7096022478. The cubic root of 87566729 is about 444.0648273305.

The spelling of 87566729 in words is "eighty-seven million, five hundred sixty-six thousand, seven hundred twenty-nine".