63643642 has 8 divisors (see below), whose sum is σ = 95502132. Its totient is φ = 31809600.

The previous prime is 63643627. The next prime is 63643649. The reversal of 63643642 is 24634636.

It can be written as a sum of positive squares in 2 ways, for example, as 62078641 + 1565001 = 7879^2 + 1251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 63643598 and 63643607.

It is not an unprimeable number, because it can be changed into a prime (63643649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3292 + ... + 11752.

Almost surely, 2^63643642 is an apocalyptic number.

63643642 is a deficient number, since it is larger than the sum of its proper divisors (31858490).

63643642 is a wasteful number, since it uses less digits than its factorization.

63643642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12224.

The product of its digits is 62208, while the sum is 34.

The square root of 63643642 is about 7977.6965347148. The cubic root of 63643642 is about 399.2562052808.

The spelling of 63643642 in words is "sixty-three million, six hundred forty-three thousand, six hundred forty-two".