667444 has 6 divisors (see below), whose sum is σ = 1168034. Its totient is φ = 333720.

The previous prime is 667441. The next prime is 667463. The reversal of 667444 is 444766.

667444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 8100 = 812^2 + 90^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83427 + ... + 83434.

2⁶⁶⁷⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

667444 is a deficient number, since it is larger than the sum of its proper divisors (500590).

667444 is a wasteful number, since it uses less digits than its factorization.

667444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166865 (or 166863 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 667444 is about 816.9724597561. The cubic root of 667444 is about 87.3919864464.

It can be divided in two parts, 667 and 444, that added together give a palindrome (1111).

The spelling of 667444 in words is "six hundred sixty-seven thousand, four hundred forty-four".