63636642 has 12 divisors (see below), whose sum is σ = 137879430. Its totient is φ = 21212208.

The previous prime is 63636611. The next prime is 63636647. The reversal of 63636642 is 24663636.

63636642 is a `hidden beast` number, since 6 + 3 + 6 + 3 + 6 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 19000881 = 6681^2 + 4359^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63636597 and 63636606.

It is not an unprimeable number, because it can be changed into a prime (63636647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1767667 + ... + 1767702.

Almost surely, 2^63636642 is an apocalyptic number.

63636642 is an abundant number, since it is smaller than the sum of its proper divisors (74242788).

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

63636642 is a wasteful number, since it uses less digits than its factorization.

63636642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535377 (or 3535374 counting only the distinct ones).

The product of its digits is 93312, while the sum is 36.

The square root of 63636642 is about 7977.2577995198. The cubic root of 63636642 is about 399.2415670241.

The spelling of 63636642 in words is "sixty-three million, six hundred thirty-six thousand, six hundred forty-two".