666744 has 32 divisors (see below), whose sum is σ = 1795920. Its totient is φ = 205056.

The previous prime is 666737. The next prime is 666749. The reversal of 666744 is 447666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666749) by changing a digit.

666744 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 7 ways as a sum of consecutive naturals, for example, 757 + ... + 1380.

2⁶⁶⁶⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

666744 is an abundant number, since it is smaller than the sum of its proper divisors (1129176).

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

666744 is a wasteful number, since it uses less digits than its factorization.

666744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2155 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 666744 is about 816.5439363562. The cubic root of 666744 is about 87.3614241875.

The spelling of 666744 in words is "six hundred sixty-six thousand, seven hundred forty-four".