63216809 has 4 divisors (see below), whose sum is σ = 63842820. Its totient is φ = 62590800.

The previous prime is 63216799. The next prime is 63216817. The reversal of 63216809 is 90861236.

63216809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43191184 + 20025625 = 6572^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 63216809 - 2¹² = 63212713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63216859) 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 in 3 ways as a sum of consecutive naturals, for example, 312854 + ... + 313055.

It is an arithmetic number, because the mean of its divisors is an integer number (15960705).

Almost surely, 2^63216809 is an apocalyptic number.

It is an amenable number.

63216809 is a deficient number, since it is larger than the sum of its proper divisors (626011).

63216809 is a wasteful number, since it uses less digits than its factorization.

63216809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626010.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 63216809 is about 7950.8998861764. The cubic root of 63216809 is about 398.3616507746.

The spelling of 63216809 in words is "sixty-three million, two hundred sixteen thousand, eight hundred nine".