87636691 has 2 divisors, whose sum is σ = 87636692. Its totient is φ = 87636690.

The previous prime is 87636677. The next prime is 87636701. The reversal of 87636691 is 19663678.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87636691 - 2⁹ = 87636179 is a prime.

It is not a weakly prime, because it can be changed into another prime (87636611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818345 + 43818346.

It is an arithmetic number, because the mean of its divisors is an integer number (43818346).

Almost surely, 2^87636691 is an apocalyptic number.

87636691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87636691 is an equidigital number, since it uses as much as digits as its factorization.

87636691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 87636691 is about 9361.4470569458. The cubic root of 87636691 is about 444.1830586632.

The spelling of 87636691 in words is "eighty-seven million, six hundred thirty-six thousand, six hundred ninety-one".