63643641 has 4 divisors (see below), whose sum is σ = 84858192. Its totient is φ = 42429092.

The previous prime is 63643627. The next prime is 63643649. The reversal of 63643641 is 14634636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63643641 - 2⁶ = 63643577 is a prime.

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, 10607271 + ... + 10607276.

It is an arithmetic number, because the mean of its divisors is an integer number (21214548).

Almost surely, 2^63643641 is an apocalyptic number.

It is an amenable number.

63643641 is a deficient number, since it is larger than the sum of its proper divisors (21214551).

63643641 is a wasteful number, since it uses less digits than its factorization.

63643641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214550.

The product of its digits is 31104, while the sum is 33.

The square root of 63643641 is about 7977.6964720400. The cubic root of 63643641 is about 399.2562031897.

The spelling of 63643641 in words is "sixty-three million, six hundred forty-three thousand, six hundred forty-one".