664176 has 40 divisors (see below), whose sum is σ = 1745424. Its totient is φ = 217600.

The previous prime is 664151. The next prime is 664177. The reversal of 664176 is 671466.

It is a super-2 number, since 2×664176² = 882259517952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664177) by changing a digit.

664176 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 4780 + ... + 4916.

2⁶⁶⁴¹⁷⁶ 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 664176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872712).

664176 is an abundant number, since it is smaller than the sum of its proper divisors (1081248).

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

664176 is a wasteful number, since it uses less digits than its factorization.

664176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 664176 is about 814.9699380959. The cubic root of 664176 is about 87.2491208249.

The spelling of 664176 in words is "six hundred sixty-four thousand, one hundred seventy-six".