667712 has 14 divisors (see below), whose sum is σ = 1325118. Its totient is φ = 333824.

The previous prime is 667699. The next prime is 667727. The reversal of 667712 is 217766.

It can be written as a sum of positive squares in only one way, i.e., 602176 + 65536 = 776^2 + 256^2 .

It is an unprimeable number.

667712 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153 + ... + 5280.

2⁶⁶⁷⁷¹² is an apocalyptic number.

It is an amenable number.

667712 is a deficient number, since it is larger than the sum of its proper divisors (657406).

667712 is a wasteful number, since it uses less digits than its factorization.

667712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10445 (or 10435 counting only the distinct ones).

The product of its digits is 3528, while the sum is 29.

The square root of 667712 is about 817.1364635115. The cubic root of 667712 is about 87.4036817688.

The spelling of 667712 in words is "six hundred sixty-seven thousand, seven hundred twelve".