673286809 has 4 divisors (see below), whose sum is σ = 725078116. Its totient is φ = 621495504.

The previous prime is 673286773. The next prime is 673286813. The reversal of 673286809 is 908682376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 95942025 + 577344784 = 9795^2 + 24028^2 .

It is a cyclic number.

It is not a de Polignac number, because 673286809 - 2¹¹ = 673284761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673286839) 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, 25895634 + ... + 25895659.

It is an arithmetic number, because the mean of its divisors is an integer number (181269529).

Almost surely, 2^673286809 is an apocalyptic number.

It is an amenable number.

673286809 is a deficient number, since it is larger than the sum of its proper divisors (51791307).

673286809 is a wasteful number, since it uses less digits than its factorization.

673286809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51791306.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 673286809 is about 25947.7707905708. The cubic root of 673286809 is about 876.4625592545.

The spelling of 673286809 in words is "six hundred seventy-three million, two hundred eighty-six thousand, eight hundred nine".