664469 has 8 divisors (see below), whose sum is σ = 725760. Its totient is φ = 604656.

The previous prime is 664459. The next prime is 664471. The reversal of 664469 is 964466.

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

It is not a de Polignac number, because 664469 - 2¹⁶ = 598933 is a prime.

It is a super-2 number, since 2×664469² = 883038103922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664459) 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, 704 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2⁶⁶⁴⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

664469 is a deficient number, since it is larger than the sum of its proper divisors (61291).

664469 is a wasteful number, since it uses less digits than its factorization.

664469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739.

The product of its digits is 31104, while the sum is 35.

The square root of 664469 is about 815.1496795068. The cubic root of 664469 is about 87.2619488675.

The spelling of 664469 in words is "six hundred sixty-four thousand, four hundred sixty-nine".