673809217 has 4 divisors (see below), whose sum is σ = 709272880. Its totient is φ = 638345556.

The previous prime is 673809209. The next prime is 673809221. The reversal of 673809217 is 712908376.

It is a happy number.

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 673809217 - 2³ = 673809209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673809277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17731803 + ... + 17731840.

It is an arithmetic number, because the mean of its divisors is an integer number (177318220).

Almost surely, 2^673809217 is an apocalyptic number.

It is an amenable number.

673809217 is a deficient number, since it is larger than the sum of its proper divisors (35463663).

673809217 is a wasteful number, since it uses less digits than its factorization.

673809217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35463662.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 673809217 is about 25957.8353681504. The cubic root of 673809217 is about 876.6891851519.

The spelling of 673809217 in words is "six hundred seventy-three million, eight hundred nine thousand, two hundred seventeen".