63561520 has 40 divisors (see below), whose sum is σ = 161217360. Its totient is φ = 23112960.

The previous prime is 63561473. The next prime is 63561527. The reversal of 63561520 is 2516536.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (63561527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35235 + ... + 36994.

It is an arithmetic number, because the mean of its divisors is an integer number (4030434).

Almost surely, 2^63561520 is an apocalyptic number.

It is an amenable number.

63561520 is an abundant number, since it is smaller than the sum of its proper divisors (97655840).

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

63561520 is a wasteful number, since it uses less digits than its factorization.

63561520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72253 (or 72247 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 63561520 is about 7972.5478988840. The cubic root of 63561520 is about 399.0844058173.

The spelling of 63561520 in words is "sixty-three million, five hundred sixty-one thousand, five hundred twenty".