63968609 has 4 divisors (see below), whose sum is σ = 63984816. Its totient is φ = 63952404.

The previous prime is 63968599. The next prime is 63968629. The reversal of 63968609 is 90686936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 63968609 - 2¹² = 63964513 is a prime.

It is a super-5 number, since 5×63968609⁵ (a number of 40 digits) contains 55555 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63968629) 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 in 3 ways as a sum of consecutive naturals, for example, 2102 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (15996204).

Almost surely, 2^63968609 is an apocalyptic number.

It is an amenable number.

63968609 is a deficient number, since it is larger than the sum of its proper divisors (16207).

63968609 is an equidigital number, since it uses as much as digits as its factorization.

63968609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16206.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 63968609 is about 7998.0378218661. The cubic root of 63968609 is about 399.9345913882.

The spelling of 63968609 in words is "sixty-three million, nine hundred sixty-eight thousand, six hundred nine".