63685218 has 64 divisors (see below), whose sum is σ = 137894400. Its totient is φ = 19568640.

The previous prime is 63685217. The next prime is 63685231. The reversal of 63685218 is 81258636.

It is a happy number.

63685218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (63685211) 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 31 ways as a sum of consecutive naturals, for example, 563530 + ... + 563642.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^63685218 is an apocalyptic number.

63685218 is an abundant number, since it is smaller than the sum of its proper divisors (74209182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63685218 is a wasteful number, since it uses less digits than its factorization.

63685218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267.

The product of its digits is 69120, while the sum is 39.

The square root of 63685218 is about 7980.3018739895. The cubic root of 63685218 is about 399.3431260487.

It can be divided in two parts, 63685 and 218, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 63685218 in words is "sixty-three million, six hundred eighty-five thousand, two hundred eighteen".