670809 has 8 divisors (see below), whose sum is σ = 923392. Its totient is φ = 432720.

The previous prime is 670781. The next prime is 670811. The reversal of 670809 is 908076.

It is a happy number.

670809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 670809 - 2⁵ = 670777 is a prime.

It is a Duffinian number.

It is a Curzon number.

670809 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (670849) 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, 3514 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (115424).

2⁶⁷⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

670809 is a deficient number, since it is larger than the sum of its proper divisors (252583).

670809 is a wasteful number, since it uses less digits than its factorization.

670809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7247.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 670809 is about 819.0293035051. The cubic root of 670809 is about 87.5386060933.

The spelling of 670809 in words is "six hundred seventy thousand, eight hundred nine".