667144 has 16 divisors (see below), whose sum is σ = 1266300. Its totient is φ = 329472.

The previous prime is 667141. The next prime is 667171. The reversal of 667144 is 441766.

It can be written as a sum of positive squares in 2 ways, for example, as 544644 + 122500 = 738^2 + 350^2 .

It is a super-2 number, since 2×667144² = 890162233472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244 + ... + 1180.

2⁶⁶⁷¹⁴⁴ is an apocalyptic number.

It is an amenable number.

667144 is a deficient number, since it is larger than the sum of its proper divisors (599156).

667144 is a wasteful number, since it uses less digits than its factorization.

667144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1028 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 667144 is about 816.7888343997. The cubic root of 667144 is about 87.3788909533.

Adding to 667144 its product of digits (4032), we get a palindrome (671176).

The spelling of 667144 in words is "six hundred sixty-seven thousand, one hundred forty-four".