63643 has 4 divisors (see below), whose sum is σ = 65728. Its totient is φ = 61560.

The previous prime is 63629. The next prime is 63647. The reversal of 63643 is 34636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63643 - 2⁵ = 63611 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (63647) 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, 996 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (16432).

2⁶³⁶⁴³ is an apocalyptic number.

63643 is a deficient number, since it is larger than the sum of its proper divisors (2085).

63643 is a wasteful number, since it uses less digits than its factorization.

63643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084.

The product of its digits is 1296, while the sum is 22.

The square root of 63643 is about 252.2756428988. The cubic root of 63643 is about 39.9254862788.

The spelling of 63643 in words is "sixty-three thousand, six hundred forty-three".