63998087 has 2 divisors, whose sum is σ = 63998088. Its totient is φ = 63998086.

The previous prime is 63998071. The next prime is 63998111. The reversal of 63998087 is 78089936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63998087 - 2⁴ = 63998071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63998027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999043 + 31999044.

It is an arithmetic number, because the mean of its divisors is an integer number (31999044).

Almost surely, 2^63998087 is an apocalyptic number.

63998087 is a deficient number, since it is larger than the sum of its proper divisors (1).

63998087 is an equidigital number, since it uses as much as digits as its factorization.

63998087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 63998087 is about 7999.8804366065. The cubic root of 63998087 is about 399.9960145436.

The spelling of 63998087 in words is "sixty-three million, nine hundred ninety-eight thousand, eighty-seven".