670646 has 4 divisors (see below), whose sum is σ = 1005972. Its totient is φ = 335322.

The previous prime is 670639. The next prime is 670669. The reversal of 670646 is 646076.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

670646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167660 + ... + 167663.

It is an arithmetic number, because the mean of its divisors is an integer number (251493).

2⁶⁷⁰⁶⁴⁶ is an apocalyptic number.

670646 is a deficient number, since it is larger than the sum of its proper divisors (335326).

670646 is a wasteful number, since it uses less digits than its factorization.

670646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335325.

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

The square root of 670646 is about 818.9297894203. The cubic root of 670646 is about 87.5315151783.

The spelling of 670646 in words is "six hundred seventy thousand, six hundred forty-six".