63438636 has 12 divisors (see below), whose sum is σ = 148023512. Its totient is φ = 21146208.

The previous prime is 63438619. The next prime is 63438647. The reversal of 63438636 is 63683436.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 63438594 and 63438603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2643265 + ... + 2643288.

Almost surely, 2^63438636 is an apocalyptic number.

It is an amenable number.

63438636 is an abundant number, since it is smaller than the sum of its proper divisors (84584876).

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

63438636 is a wasteful number, since it uses less digits than its factorization.

63438636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286560 (or 5286558 counting only the distinct ones).

The product of its digits is 186624, while the sum is 39.

The square root of 63438636 is about 7964.8374748014. The cubic root of 63438636 is about 398.8270555318.

The spelling of 63438636 in words is "sixty-three million, four hundred thirty-eight thousand, six hundred thirty-six".