673509321 has 24 divisors (see below), whose sum is σ = 1032145920. Its totient is φ = 422011296.

The previous prime is 673509307. The next prime is 673509323. The reversal of 673509321 is 123905376.

673509321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 673509321 - 2⁹ = 673508809 is a prime.

It is a super-2 number, since 2×673509321² = 907229610947762082, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (673509323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6211 + ... + 37223.

It is an arithmetic number, because the mean of its divisors is an integer number (43006080).

Almost surely, 2^673509321 is an apocalyptic number.

It is an amenable number.

673509321 is a deficient number, since it is larger than the sum of its proper divisors (358636599).

673509321 is a wasteful number, since it uses less digits than its factorization.

673509321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31165 (or 31162 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 673509321 is about 25952.0581264762. The cubic root of 673509321 is about 876.5591015473.

The spelling of 673509321 in words is "six hundred seventy-three million, five hundred nine thousand, three hundred twenty-one".