87686891 has 2 divisors, whose sum is σ = 87686892. Its totient is φ = 87686890.

The previous prime is 87686869. The next prime is 87686939. The reversal of 87686891 is 19868678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87686891 - 2²² = 83492587 is a prime.

It is not a weakly prime, because it can be changed into another prime (87686831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43843445 + 43843446.

It is an arithmetic number, because the mean of its divisors is an integer number (43843446).

Almost surely, 2^87686891 is an apocalyptic number.

87686891 is a deficient number, since it is larger than the sum of its proper divisors (1).

87686891 is an equidigital number, since it uses as much as digits as its factorization.

87686891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 53.

The square root of 87686891 is about 9364.1278825099. The cubic root of 87686891 is about 444.2678547042.

The spelling of 87686891 in words is "eighty-seven million, six hundred eighty-six thousand, eight hundred ninety-one".