87643207 has 2 divisors, whose sum is σ = 87643208. Its totient is φ = 87643206.

The previous prime is 87643201. The next prime is 87643217. The reversal of 87643207 is 70234678.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87643207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87643201) 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, 43821603 + 43821604.

It is an arithmetic number, because the mean of its divisors is an integer number (43821604).

Almost surely, 2^87643207 is an apocalyptic number.

87643207 is a deficient number, since it is larger than the sum of its proper divisors (1).

87643207 is an equidigital number, since it uses as much as digits as its factorization.

87643207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 87643207 is about 9361.7950735957. The cubic root of 87643207 is about 444.1940670854.

The spelling of 87643207 in words is "eighty-seven million, six hundred forty-three thousand, two hundred seven".