86642687 has 2 divisors, whose sum is σ = 86642688. Its totient is φ = 86642686.

The previous prime is 86642671. The next prime is 86642707. The reversal of 86642687 is 78624668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86642687 - 2⁴ = 86642671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86642627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43321343 + 43321344.

It is an arithmetic number, because the mean of its divisors is an integer number (43321344).

Almost surely, 2^86642687 is an apocalyptic number.

86642687 is a deficient number, since it is larger than the sum of its proper divisors (1).

86642687 is an equidigital number, since it uses as much as digits as its factorization.

86642687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 47.

The square root of 86642687 is about 9308.2053587144. The cubic root of 86642687 is about 442.4973125907.

The spelling of 86642687 in words is "eighty-six million, six hundred forty-two thousand, six hundred eighty-seven".