667604 has 24 divisors (see below), whose sum is σ = 1353408. Its totient is φ = 282240.

The previous prime is 667577. The next prime is 667631. The reversal of 667604 is 406766.

It is an interprime number because it is at equal distance from previous prime (667577) and next prime (667631).

It is a congruent number.

It is an unprimeable number.

667604 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3059 + ... + 3269.

It is an arithmetic number, because the mean of its divisors is an integer number (56392).

2⁶⁶⁷⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

667604 is an abundant number, since it is smaller than the sum of its proper divisors (685804).

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

667604 is a wasteful number, since it uses less digits than its factorization.

667604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 667604 is about 817.0703764059. The cubic root of 667604 is about 87.3989691050.

The spelling of 667604 in words is "six hundred sixty-seven thousand, six hundred four".