721704841 has 16 divisors (see below), whose sum is σ = 848655360. Its totient is φ = 605070720.

The previous prime is 721704839. The next prime is 721704871. The reversal of 721704841 is 148407127.

It is a cyclic number.

It is not a de Polignac number, because 721704841 - 2¹ = 721704839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721704797 and 721704806.

It is not an unprimeable number, because it can be changed into a prime (721704811) 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 15 ways as a sum of consecutive naturals, for example, 249240 + ... + 252118.

It is an arithmetic number, because the mean of its divisors is an integer number (53040960).

Almost surely, 2^721704841 is an apocalyptic number.

It is an amenable number.

721704841 is a deficient number, since it is larger than the sum of its proper divisors (126950519).

721704841 is a wasteful number, since it uses less digits than its factorization.

721704841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 721704841 is about 26864.5647833722. The cubic root of 721704841 is about 896.9878067483.

The spelling of 721704841 in words is "seven hundred twenty-one million, seven hundred four thousand, eight hundred forty-one".