670643 has 8 divisors (see below), whose sum is σ = 721920. Its totient is φ = 621000.

The previous prime is 670639. The next prime is 670669. The reversal of 670643 is 346076.

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 670643 - 2² = 670639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (670613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518 + ... + 1268.

It is an arithmetic number, because the mean of its divisors is an integer number (90240).

2⁶⁷⁰⁶⁴³ is an apocalyptic number.

670643 is a deficient number, since it is larger than the sum of its proper divisors (51277).

670643 is a wasteful number, since it uses less digits than its factorization.

670643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 670643 is about 818.9279577594. The cubic root of 670643 is about 87.5313846599.

The spelling of 670643 in words is "six hundred seventy thousand, six hundred forty-three".