721675673 has 2 divisors, whose sum is σ = 721675674. Its totient is φ = 721675672.

The previous prime is 721675657. The next prime is 721675697. The reversal of 721675673 is 376576127.

721675673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706868569 + 14807104 = 26587^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 721675673 - 2⁴ = 721675657 is a prime.

It is not a weakly prime, because it can be changed into another prime (721675373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837836 + 360837837.

It is an arithmetic number, because the mean of its divisors is an integer number (360837837).

Almost surely, 2^721675673 is an apocalyptic number.

It is an amenable number.

721675673 is a deficient number, since it is larger than the sum of its proper divisors (1).

721675673 is an equidigital number, since it uses as much as digits as its factorization.

721675673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 44.

The square root of 721675673 is about 26864.0219066319. The cubic root of 721675673 is about 896.9757225410.

The spelling of 721675673 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, six hundred seventy-three".