64447 has 6 divisors (see below), whose sum is σ = 68768. Its totient is φ = 60384.

The previous prime is 64439. The next prime is 64451. The reversal of 64447 is 74446.

It is a happy number.

64447 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 64447 - 2³ = 64439 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178 + ... + 400.

2⁶⁴⁴⁴⁷ is an apocalyptic number.

64447 is a deficient number, since it is larger than the sum of its proper divisors (4321).

64447 is a wasteful number, since it uses less digits than its factorization.

64447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 240 counting only the distinct ones).

The product of its digits is 2688, while the sum is 25.

The square root of 64447 is about 253.8641368922. The cubic root of 64447 is about 40.0929090307.

Subtracting 64447 from its reverse (74446), we obtain a palindrome (9999).

The spelling of 64447 in words is "sixty-four thousand, four hundred forty-seven".