660312 has 40 divisors (see below), whose sum is σ = 1851300. Its totient is φ = 219888.

The previous prime is 660299. The next prime is 660329. The reversal of 660312 is 213066.

It is a happy number.

660312 is a `hidden beast` number, since 660 + 3 + 1 + 2 = 666.

660312 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 660312.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 139 + ... + 1157.

2⁶⁶⁰³¹² 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 660312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925650).

660312 is an abundant number, since it is smaller than the sum of its proper divisors (1190988).

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

660312 is a wasteful number, since it uses less digits than its factorization.

660312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 660312 is about 812.5958405013. The cubic root of 660312 is about 87.0795942220.

Adding to 660312 its reverse (213066), we get a palindrome (873378).

The spelling of 660312 in words is "six hundred sixty thousand, three hundred twelve".