64671 has 4 divisors (see below), whose sum is σ = 86232. Its totient is φ = 43112.

The previous prime is 64667. The next prime is 64679. The reversal of 64671 is 17646.

64671 is nontrivially palindromic in base 12.

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 64671 - 2² = 64667 is a prime.

It is a D-number.

64671 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64679) 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, 10776 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (21558).

2⁶⁴⁶⁷¹ is an apocalyptic number.

64671 is a deficient number, since it is larger than the sum of its proper divisors (21561).

64671 is a wasteful number, since it uses less digits than its factorization.

64671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21560.

The product of its digits is 1008, while the sum is 24.

The square root of 64671 is about 254.3049350681. The cubic root of 64671 is about 40.1393059498.

It can be divided in two parts, 646 and 71, that added together give a palindrome (717).

The spelling of 64671 in words is "sixty-four thousand, six hundred seventy-one".