670641 has 4 divisors (see below), whose sum is σ = 894192. Its totient is φ = 447092.

The previous prime is 670639. The next prime is 670669. The reversal of 670641 is 146076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670641 - 2¹ = 670639 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (670541) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 111771 + ... + 111776.

It is an arithmetic number, because the mean of its divisors is an integer number (223548).

2⁶⁷⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

670641 is a deficient number, since it is larger than the sum of its proper divisors (223551).

670641 is a wasteful number, since it uses less digits than its factorization.

670641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223550.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 670641 is about 818.9267366499. The cubic root of 670641 is about 87.5312976474.

The spelling of 670641 in words is "six hundred seventy thousand, six hundred forty-one".