63561636 has 36 divisors (see below), whose sum is σ = 160952064. Its totient is φ = 21150000.

The previous prime is 63561613. The next prime is 63561637. The reversal of 63561636 is 63616536.

It is a happy number.

63561636 is a `hidden beast` number, since 6 + 3 + 5 + 616 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 63561636.

It is not an unprimeable number, because it can be changed into a prime (63561637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25861 + ... + 28211.

Almost surely, 2^63561636 is an apocalyptic number.

It is an amenable number.

63561636 is an abundant number, since it is smaller than the sum of its proper divisors (97390428).

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

63561636 is a wasteful number, since it uses less digits than its factorization.

63561636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112 (or 3107 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 63561636 is about 7972.5551738448. Note that the first 3 decimals coincide. The cubic root of 63561636 is about 399.0846485940.

The spelling of 63561636 in words is "sixty-three million, five hundred sixty-one thousand, six hundred thirty-six".