664269 has 8 divisors (see below), whose sum is σ = 891360. Its totient is φ = 440016.

The previous prime is 664253. The next prime is 664271. The reversal of 664269 is 962466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664269 - 2⁴ = 664253 is a prime.

It is a super-2 number, since 2×664269² = 882506608722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 6⁶ + 6⁶ + 2¹⁹ + 4 + 6⁶ + 9 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (111420).

2⁶⁶⁴²⁶⁹ is an apocalyptic number.

It is an amenable number.

664269 is a deficient number, since it is larger than the sum of its proper divisors (227091).

664269 is a wasteful number, since it uses less digits than its factorization.

664269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419.

The product of its digits is 15552, while the sum is 33.

The square root of 664269 is about 815.0269934180. The cubic root of 664269 is about 87.2531929330.

The spelling of 664269 in words is "six hundred sixty-four thousand, two hundred sixty-nine".