664170 has 48 divisors (see below), whose sum is σ = 1739232. Its totient is φ = 162240.

The previous prime is 664151. The next prime is 664177. The reversal of 664170 is 71466.

664170 = 220² + 221² + ... + 232².

It is a super-2 number, since 2×664170² = 882243577800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664170.

It is a congruent number.

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

664170 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 23 ways as a sum of consecutive naturals, for example, 5005 + ... + 5135.

It is an arithmetic number, because the mean of its divisors is an integer number (36234).

2⁶⁶⁴¹⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869616).

664170 is an abundant number, since it is smaller than the sum of its proper divisors (1075062).

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

664170 is a wasteful number, since it uses less digits than its factorization.

664170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 664170 is about 814.9662569702. The cubic root of 664170 is about 87.2488580951.

Subtracting from 664170 its reverse (71466), we obtain a cube (592704 = 84³).

The spelling of 664170 in words is "six hundred sixty-four thousand, one hundred seventy".