64689 has 4 divisors (see below), whose sum is σ = 86256. Its totient is φ = 43124.

The previous prime is 64679. The next prime is 64693. The reversal of 64689 is 98646.

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 64689 - 2⁸ = 64433 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (64609) 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, 10779 + ... + 10784.

It is an arithmetic number, because the mean of its divisors is an integer number (21564).

2⁶⁴⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

64689 is a deficient number, since it is larger than the sum of its proper divisors (21567).

64689 is a wasteful number, since it uses less digits than its factorization.

64689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21566.

The product of its digits is 10368, while the sum is 33.

The square root of 64689 is about 254.3403231892. The cubic root of 64689 is about 40.1430296203.

Adding to 64689 its product of digits (10368), we get a palindrome (75057).

The spelling of 64689 in words is "sixty-four thousand, six hundred eighty-nine".