673488721 has 8 divisors (see below), whose sum is σ = 704543400. Its totient is φ = 642956160.

The previous prime is 673488653. The next prime is 673488727. The reversal of 673488721 is 127884376.

It can be written as a sum of positive squares in 4 ways, for example, as 199120321 + 474368400 = 14111^2 + 21780^2 .

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 673488721 - 2⁹ = 673488209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673488727) 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, 127890 + ... + 133051.

It is an arithmetic number, because the mean of its divisors is an integer number (88067925).

Almost surely, 2^673488721 is an apocalyptic number.

It is an amenable number.

673488721 is a deficient number, since it is larger than the sum of its proper divisors (31054679).

673488721 is a wasteful number, since it uses less digits than its factorization.

673488721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261059.

The product of its digits is 451584, while the sum is 46.

The square root of 673488721 is about 25951.6612377705. The cubic root of 673488721 is about 876.5501646249.

The spelling of 673488721 in words is "six hundred seventy-three million, four hundred eighty-eight thousand, seven hundred twenty-one".