87568709 has 2 divisors, whose sum is σ = 87568710. Its totient is φ = 87568708.

The previous prime is 87568699. The next prime is 87568759. The reversal of 87568709 is 90786578.

It is a happy number.

It is an a-pointer prime, because the next prime (87568759) can be obtained adding 87568709 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82264900 + 5303809 = 9070^2 + 2303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87568709 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87568759) 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, 43784354 + 43784355.

It is an arithmetic number, because the mean of its divisors is an integer number (43784355).

Almost surely, 2^87568709 is an apocalyptic number.

It is an amenable number.

87568709 is a deficient number, since it is larger than the sum of its proper divisors (1).

87568709 is an equidigital number, since it uses as much as digits as its factorization.

87568709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 87568709 is about 9357.8153967686. The cubic root of 87568709 is about 444.0681742704.

The spelling of 87568709 in words is "eighty-seven million, five hundred sixty-eight thousand, seven hundred nine".