664461 has 24 divisors (see below), whose sum is σ = 1123200. Its totient is φ = 370656.

The previous prime is 664459. The next prime is 664471. The reversal of 664461 is 164466.

It is not a de Polignac number, because 664461 - 2¹ = 664459 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3240 + ... + 3438.

It is an arithmetic number, because the mean of its divisors is an integer number (46800).

2⁶⁶⁴⁴⁶¹ is an apocalyptic number.

It is an amenable number.

664461 is a deficient number, since it is larger than the sum of its proper divisors (458739).

664461 is a wasteful number, since it uses less digits than its factorization.

664461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 262 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 664461 is about 815.1447724178. The cubic root of 664461 is about 87.2615986639.

The spelling of 664461 in words is "six hundred sixty-four thousand, four hundred sixty-one".