87636641 has 2 divisors, whose sum is σ = 87636642. Its totient is φ = 87636640.

The previous prime is 87636631. The next prime is 87636671. The reversal of 87636641 is 14663678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86415616 + 1221025 = 9296^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87636641 is a prime.

It is a Chen prime.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818320 + 43818321.

It is an arithmetic number, because the mean of its divisors is an integer number (43818321).

Almost surely, 2^87636641 is an apocalyptic number.

It is an amenable number.

87636641 is a deficient number, since it is larger than the sum of its proper divisors (1).

87636641 is an equidigital number, since it uses as much as digits as its factorization.

87636641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 87636641 is about 9361.4443864182. Note that the first 3 decimals coincide. The cubic root of 87636641 is about 444.1829741889.

The spelling of 87636641 in words is "eighty-seven million, six hundred thirty-six thousand, six hundred forty-one".