673559821 has 8 divisors (see below), whose sum is σ = 735235488. Its totient is φ = 611958000.

The previous prime is 673559819. The next prime is 673559833. The reversal of 673559821 is 128955376.

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 673559821 - 2¹ = 673559819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673559801) 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, 1566 + ... + 36736.

It is an arithmetic number, because the mean of its divisors is an integer number (91904436).

Almost surely, 2^673559821 is an apocalyptic number.

It is an amenable number.

673559821 is a deficient number, since it is larger than the sum of its proper divisors (61675667).

673559821 is a wasteful number, since it uses less digits than its factorization.

673559821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36923.

The product of its digits is 453600, while the sum is 46.

The square root of 673559821 is about 25953.0310561214. The cubic root of 673559821 is about 876.5810092511.

The spelling of 673559821 in words is "six hundred seventy-three million, five hundred fifty-nine thousand, eight hundred twenty-one".