63969 has 4 divisors (see below), whose sum is σ = 85296. Its totient is φ = 42644.

The previous prime is 63949. The next prime is 63977. The reversal of 63969 is 96936.

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 63969 - 2⁷ = 63841 is a prime.

It is a super-2 number, since 2×63969² = 8184065922, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (63929) 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, 10659 + ... + 10664.

It is an arithmetic number, because the mean of its divisors is an integer number (21324).

2⁶³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

63969 is a deficient number, since it is larger than the sum of its proper divisors (21327).

63969 is a wasteful number, since it uses less digits than its factorization.

63969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21326.

The product of its digits is 8748, while the sum is 33.

The square root of 63969 is about 252.9209362627. The cubic root of 63969 is about 39.9935406236.

Subtracting from 63969 its sum of digits (33), we obtain a palindrome (63936).

The spelling of 63969 in words is "sixty-three thousand, nine hundred sixty-nine".