63531220 has 24 divisors (see below), whose sum is σ = 137022984. Its totient is φ = 24725376.

The previous prime is 63531211. The next prime is 63531229. The reversal of 63531220 is 2213536.

63531220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (63531211) and next prime (63531229).

It can be written as a sum of positive squares in 4 ways, for example, as 41139396 + 22391824 = 6414^2 + 4732^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63531191 and 63531200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63531229) 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 7 ways as a sum of consecutive naturals, for example, 42187 + ... + 43666.

It is an arithmetic number, because the mean of its divisors is an integer number (5709291).

Almost surely, 2^63531220 is an apocalyptic number.

It is an amenable number.

63531220 is an abundant number, since it is smaller than the sum of its proper divisors (73491764).

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

63531220 is a wasteful number, since it uses less digits than its factorization.

63531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85899 (or 85897 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 63531220 is about 7970.6474015603. The cubic root of 63531220 is about 399.0209807582.

Adding to 63531220 its reverse (2213536), we get a palindrome (65744756).

The spelling of 63531220 in words is "sixty-three million, five hundred thirty-one thousand, two hundred twenty".