664467 has 4 divisors (see below), whose sum is σ = 885960. Its totient is φ = 442976.

The previous prime is 664459. The next prime is 664471. The reversal of 664467 is 764466.

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 664467 - 2³ = 664459 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664467.

It is not an unprimeable number, because it can be changed into a prime (664427) 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, 110742 + ... + 110747.

It is an arithmetic number, because the mean of its divisors is an integer number (221490).

2⁶⁶⁴⁴⁶⁷ is an apocalyptic number.

664467 is a deficient number, since it is larger than the sum of its proper divisors (221493).

664467 is a wasteful number, since it uses less digits than its factorization.

664467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221492.

The product of its digits is 24192, while the sum is 33.

The square root of 664467 is about 815.1484527373. The cubic root of 664467 is about 87.2618613168.

Subtracting 664467 from its reverse (764466), we obtain a palindrome (99999).

The spelling of 664467 in words is "six hundred sixty-four thousand, four hundred sixty-seven".