63685220 has 24 divisors (see below), whose sum is σ = 135934008. Its totient is φ = 25056000.

The previous prime is 63685217. The next prime is 63685231. The reversal of 63685220 is 2258636.

63685220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2876416 + 60808804 = 1696^2 + 7798^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24881 + ... + 27320.

It is an arithmetic number, because the mean of its divisors is an integer number (5663917).

Almost surely, 2^63685220 is an apocalyptic number.

It is an amenable number.

63685220 is an abundant number, since it is smaller than the sum of its proper divisors (72248788).

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

63685220 is a wasteful number, since it uses less digits than its factorization.

63685220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52271 (or 52269 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 63685220 is about 7980.3019992980. The cubic root of 63685220 is about 399.3431302291.

The spelling of 63685220 in words is "sixty-three million, six hundred eighty-five thousand, two hundred twenty".