63993689 has 2 divisors, whose sum is σ = 63993690. Its totient is φ = 63993688.

The previous prime is 63993667. The next prime is 63993719. The reversal of 63993689 is 98639936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 29888089 = 5840^2 + 5467^2 .

It is a cyclic number.

It is not a de Polignac number, because 63993689 - 2¹² = 63989593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63993689.

It is not a weakly prime, because it can be changed into another prime (63993089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31996844 + 31996845.

It is an arithmetic number, because the mean of its divisors is an integer number (31996845).

Almost surely, 2^63993689 is an apocalyptic number.

It is an amenable number.

63993689 is a deficient number, since it is larger than the sum of its proper divisors (1).

63993689 is an equidigital number, since it uses as much as digits as its factorization.

63993689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 53.

The square root of 63993689 is about 7999.6055527757. The cubic root of 63993689 is about 399.9868516511.

The spelling of 63993689 in words is "sixty-three million, nine hundred ninety-three thousand, six hundred eighty-nine".