673320321 has 12 divisors (see below), whose sum is σ = 990924948. Its totient is φ = 440410464.

The previous prime is 673320313. The next prime is 673320353. The reversal of 673320321 is 123023376.

673320321 is a `hidden beast` number, since 6 + 7 + 332 + 0 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 563825025 + 109495296 = 23745^2 + 10464^2 .

It is not a de Polignac number, because 673320321 - 2³ = 673320313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673320311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 705310 + ... + 706263.

It is an arithmetic number, because the mean of its divisors is an integer number (82577079).

Almost surely, 2^673320321 is an apocalyptic number.

It is an amenable number.

673320321 is a deficient number, since it is larger than the sum of its proper divisors (317604627).

673320321 is a wasteful number, since it uses less digits than its factorization.

673320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411632 (or 1411629 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 673320321 is about 25948.4165412844. The cubic root of 673320321 is about 876.4771006186.

Adding to 673320321 its reverse (123023376), we get a palindrome (796343697).

The spelling of 673320321 in words is "six hundred seventy-three million, three hundred twenty thousand, three hundred twenty-one".