667623 has 8 divisors (see below), whose sum is σ = 971136. Its totient is φ = 404600.

The previous prime is 667577. The next prime is 667631. The reversal of 667623 is 326766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667623 - 2⁶ = 667559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10083 + ... + 10148.

It is an arithmetic number, because the mean of its divisors is an integer number (121392).

2⁶⁶⁷⁶²³ is an apocalyptic number.

667623 is a deficient number, since it is larger than the sum of its proper divisors (303513).

667623 is a wasteful number, since it uses less digits than its factorization.

667623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20245.

The product of its digits is 9072, while the sum is 30.

The square root of 667623 is about 817.0820032286. The cubic root of 667623 is about 87.3997982216.

The spelling of 667623 in words is "six hundred sixty-seven thousand, six hundred twenty-three".