673444721 has 16 divisors (see below), whose sum is σ = 728414400. Its totient is φ = 620524800.

The previous prime is 673444679. The next prime is 673444741. The reversal of 673444721 is 127444376.

673444721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-673444721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (673444741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294101 + ... + 296381.

It is an arithmetic number, because the mean of its divisors is an integer number (45525900).

Almost surely, 2^673444721 is an apocalyptic number.

It is an amenable number.

673444721 is a deficient number, since it is larger than the sum of its proper divisors (54969679).

673444721 is a wasteful number, since it uses less digits than its factorization.

673444721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720.

The product of its digits is 112896, while the sum is 38.

The square root of 673444721 is about 25950.8134939928. The cubic root of 673444721 is about 876.5310754424.

The spelling of 673444721 in words is "six hundred seventy-three million, four hundred forty-four thousand, seven hundred twenty-one".