664056 has 48 divisors (see below), whose sum is σ = 1881360. Its totient is φ = 211200.

The previous prime is 664043. The next prime is 664061. The reversal of 664056 is 650466.

It is a super-2 number, since 2×664056² = 881940742272, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664056.

It is an unprimeable number.

664056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1456 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (39195).

2⁶⁶⁴⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940680).

664056 is an abundant number, since it is smaller than the sum of its proper divisors (1217304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664056 is a wasteful number, since it uses less digits than its factorization.

664056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 664056 is about 814.8963124226. The cubic root of 664056 is about 87.2438659300.

The spelling of 664056 in words is "six hundred sixty-four thousand, fifty-six".