63987563 has 2 divisors, whose sum is σ = 63987564. Its totient is φ = 63987562.

The previous prime is 63987557. The next prime is 63987571. The reversal of 63987563 is 36578936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63987563 - 2¹⁴ = 63971179 is a prime.

It is not a weakly prime, because it can be changed into another prime (63987523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31993781 + 31993782.

It is an arithmetic number, because the mean of its divisors is an integer number (31993782).

Almost surely, 2^63987563 is an apocalyptic number.

63987563 is a deficient number, since it is larger than the sum of its proper divisors (1).

63987563 is an equidigital number, since it uses as much as digits as its factorization.

63987563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 63987563 is about 7999.2226497329. Note that the first 3 decimals coincide. The cubic root of 63987563 is about 399.9740879048.

The spelling of 63987563 in words is "sixty-three million, nine hundred eighty-seven thousand, five hundred sixty-three".