667312 has 20 divisors (see below), whose sum is σ = 1305720. Its totient is φ = 330368.

The previous prime is 667309. The next prime is 667321. The reversal of 667312 is 213766.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2748 + ... + 2980.

It is an arithmetic number, because the mean of its divisors is an integer number (65286).

2⁶⁶⁷³¹² is an apocalyptic number.

It is an amenable number.

667312 is a deficient number, since it is larger than the sum of its proper divisors (638408).

667312 is a wasteful number, since it uses less digits than its factorization.

667312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 414 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 667312 is about 816.8916696845. The cubic root of 667312 is about 87.3862249130.

It can be divided in two parts, 667 and 312, that added together give a palindrome (979).

The spelling of 667312 in words is "six hundred sixty-seven thousand, three hundred twelve".