726046721 has 4 divisors (see below), whose sum is σ = 726146772. Its totient is φ = 725946672.

The previous prime is 726046679. The next prime is 726046751. The reversal of 726046721 is 127640627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82156096 + 643890625 = 9064^2 + 25375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726046721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726046751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38210 + ... + 53963.

It is an arithmetic number, because the mean of its divisors is an integer number (181536693).

Almost surely, 2^726046721 is an apocalyptic number.

It is an amenable number.

726046721 is a deficient number, since it is larger than the sum of its proper divisors (100051).

726046721 is an equidigital number, since it uses as much as digits as its factorization.

726046721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100050.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 726046721 is about 26945.2541461386. The cubic root of 726046721 is about 898.7830139728.

The spelling of 726046721 in words is "seven hundred twenty-six million, forty-six thousand, seven hundred twenty-one".