64669 has 4 divisors (see below), whose sum is σ = 70560. Its totient is φ = 58780.

The previous prime is 64667. The next prime is 64679. The reversal of 64669 is 96646.

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 64669 - 2¹ = 64667 is a prime.

It is a super-2 number, since 2×64669² = 8364159122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2929 + ... + 2950.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2⁶⁴⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

64669 is a deficient number, since it is larger than the sum of its proper divisors (5891).

64669 is a wasteful number, since it uses less digits than its factorization.

64669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5890.

The product of its digits is 7776, while the sum is 31.

The square root of 64669 is about 254.3010027507. The cubic root of 64669 is about 40.1388921660.

The spelling of 64669 in words is "sixty-four thousand, six hundred sixty-nine".