63581856 has 72 divisors (see below), whose sum is σ = 180774720. Its totient is φ = 19558656.

The previous prime is 63581839. The next prime is 63581863. The reversal of 63581856 is 65818536.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14265 + ... + 18183.

It is an arithmetic number, because the mean of its divisors is an integer number (2510760).

Almost surely, 2^63581856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63581856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90387360).

63581856 is an abundant number, since it is smaller than the sum of its proper divisors (117192864).

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

63581856 is a wasteful number, since it uses less digits than its factorization.

63581856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958 (or 3937 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 63581856 is about 7973.8231733592. The cubic root of 63581856 is about 399.1269625671.

The spelling of 63581856 in words is "sixty-three million, five hundred eighty-one thousand, eight hundred fifty-six".