673055721 has 24 divisors (see below), whose sum is σ = 1108565640. Its totient is φ = 389822976.

The previous prime is 673055689. The next prime is 673055767. The reversal of 673055721 is 127550376.

It can be written as a sum of positive squares in 4 ways, for example, as 161798400 + 511257321 = 12720^2 + 22611^2 .

It is not a de Polignac number, because 673055721 - 2⁵ = 673055689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673055771) 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, 167206 + ... + 171183.

It is an arithmetic number, because the mean of its divisors is an integer number (46190235).

Almost surely, 2^673055721 is an apocalyptic number.

It is an amenable number.

673055721 is a deficient number, since it is larger than the sum of its proper divisors (435509919).

673055721 is a wasteful number, since it uses less digits than its factorization.

673055721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338425 (or 338422 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 673055721 is about 25943.3174632698. The cubic root of 673055721 is about 876.3622735348.

The spelling of 673055721 in words is "six hundred seventy-three million, fifty-five thousand, seven hundred twenty-one".