675809 has 4 divisors (see below), whose sum is σ = 705216. Its totient is φ = 646404.

The previous prime is 675797. The next prime is 675817. The reversal of 675809 is 908576.

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 675809 - 2⁸ = 675553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 675809.

It is not an unprimeable number, because it can be changed into a prime (675839) 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, 14669 + ... + 14714.

It is an arithmetic number, because the mean of its divisors is an integer number (176304).

2⁶⁷⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

675809 is a deficient number, since it is larger than the sum of its proper divisors (29407).

675809 is a wasteful number, since it uses less digits than its factorization.

675809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29406.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 675809 is about 822.0760305471. The cubic root of 675809 is about 87.7555630491.

The spelling of 675809 in words is "six hundred seventy-five thousand, eight hundred nine".