673398561 has 8 divisors (see below), whose sum is σ = 979488864. Its totient is φ = 408120320.

The previous prime is 673398559. The next prime is 673398571. The reversal of 673398561 is 165893376.

It is a happy number.

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 673398561 - 2¹ = 673398559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673398561.

It is not an unprimeable number, because it can be changed into a prime (673398511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10202976 + ... + 10203041.

It is an arithmetic number, because the mean of its divisors is an integer number (122436108).

Almost surely, 2^673398561 is an apocalyptic number.

It is an amenable number.

673398561 is a deficient number, since it is larger than the sum of its proper divisors (306090303).

673398561 is a wasteful number, since it uses less digits than its factorization.

673398561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20406031.

The product of its digits is 816480, while the sum is 48.

The square root of 673398561 is about 25949.9241039353. The cubic root of 673398561 is about 876.5110482610.

The spelling of 673398561 in words is "six hundred seventy-three million, three hundred ninety-eight thousand, five hundred sixty-one".