664216 has 32 divisors (see below), whose sum is σ = 1476000. Its totient is φ = 274176.

The previous prime is 664211. The next prime is 664243. The reversal of 664216 is 612466.

664216 = T₄₈ + T₄₉ + ... + T₁₅₉.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1420 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (46125).

2⁶⁶⁴²¹⁶ 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 664216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738000).

664216 is an abundant number, since it is smaller than the sum of its proper divisors (811784).

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

664216 is a wasteful number, since it uses less digits than its factorization.

664216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 447 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 664216 is about 814.9944785089. The cubic root of 664216 is about 87.2508723158.

The spelling of 664216 in words is "six hundred sixty-four thousand, two hundred sixteen".