673379721 has 24 divisors (see below), whose sum is σ = 1113088704. Its totient is φ = 384276960.

The previous prime is 673379719. The next prime is 673379753. The reversal of 673379721 is 127973376.

It is not a de Polignac number, because 673379721 - 2¹ = 673379719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673379771) 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 23 ways as a sum of consecutive naturals, for example, 43506 + ... + 56916.

It is an arithmetic number, because the mean of its divisors is an integer number (46378696).

Almost surely, 2^673379721 is an apocalyptic number.

It is an amenable number.

673379721 is a deficient number, since it is larger than the sum of its proper divisors (439708983).

673379721 is a wasteful number, since it uses less digits than its factorization.

673379721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14221 (or 14218 counting only the distinct ones).

The product of its digits is 333396, while the sum is 45.

The square root of 673379721 is about 25949.5610945542. The cubic root of 673379721 is about 876.5028739924.

The spelling of 673379721 in words is "six hundred seventy-three million, three hundred seventy-nine thousand, seven hundred twenty-one".