667724 has 6 divisors (see below), whose sum is σ = 1168524. Its totient is φ = 333860.

The previous prime is 667699. The next prime is 667727. The reversal of 667724 is 427766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (667727) 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 as a sum of consecutive naturals, namely, 83462 + ... + 83469.

It is an arithmetic number, because the mean of its divisors is an integer number (194754).

2⁶⁶⁷⁷²⁴ is an apocalyptic number.

It is an amenable number.

667724 is a deficient number, since it is larger than the sum of its proper divisors (500800).

667724 is a wasteful number, since it uses less digits than its factorization.

667724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166935 (or 166933 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 667724 is about 817.1438061933. The cubic root of 667724 is about 87.4042053668.

The spelling of 667724 in words is "six hundred sixty-seven thousand, seven hundred twenty-four".