87643187 has 2 divisors, whose sum is σ = 87643188. Its totient is φ = 87643186.

The previous prime is 87643163. The next prime is 87643201. The reversal of 87643187 is 78134678.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87643187 - 2⁶ = 87643123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87643987) 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, 43821593 + 43821594.

It is an arithmetic number, because the mean of its divisors is an integer number (43821594).

Almost surely, 2^87643187 is an apocalyptic number.

87643187 is a deficient number, since it is larger than the sum of its proper divisors (1).

87643187 is an equidigital number, since it uses as much as digits as its factorization.

87643187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 87643187 is about 9361.7940054244. The cubic root of 87643187 is about 444.1940332974.

The spelling of 87643187 in words is "eighty-seven million, six hundred forty-three thousand, one hundred eighty-seven".