672809 has 8 divisors (see below), whose sum is σ = 750240. Its totient is φ = 599616.

The previous prime is 672803. The next prime is 672811. The reversal of 672809 is 908276.

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

It is a cyclic number.

It is not a de Polignac number, because 672809 - 2¹² = 668713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719 + ... + 1364.

It is an arithmetic number, because the mean of its divisors is an integer number (93780).

2⁶⁷²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

672809 is a deficient number, since it is larger than the sum of its proper divisors (77431).

672809 is a wasteful number, since it uses less digits than its factorization.

672809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 672809 is about 820.2493523314. The cubic root of 672809 is about 87.6255178191.

The spelling of 672809 in words is "six hundred seventy-two thousand, eight hundred nine".