673013821 has 12 divisors (see below), whose sum is σ = 691544800. Its totient is φ = 654956280.

The previous prime is 673013819. The next prime is 673013849. The reversal of 673013821 is 128310376.

It is not a de Polignac number, because 673013821 - 2¹ = 673013819 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 (673013921) 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 11 ways as a sum of consecutive naturals, for example, 438826 + ... + 440356.

Almost surely, 2^673013821 is an apocalyptic number.

It is an amenable number.

673013821 is a deficient number, since it is larger than the sum of its proper divisors (18530979).

673013821 is a wasteful number, since it uses less digits than its factorization.

673013821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 673013821 is about 25942.5099209772. The cubic root of 673013821 is about 876.3440876501.

The spelling of 673013821 in words is "six hundred seventy-three million, thirteen thousand, eight hundred twenty-one".