726743665 has 4 divisors (see below), whose sum is σ = 872092404. Its totient is φ = 581394928.

The previous prime is 726743663. The next prime is 726743669. The reversal of 726743665 is 566347627.

726743665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 496220176 + 230523489 = 22276^2 + 15183^2 .

It is a cyclic number.

It is not a de Polignac number, because 726743665 - 2¹ = 726743663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726743663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72674362 + ... + 72674371.

It is an arithmetic number, because the mean of its divisors is an integer number (218023101).

Almost surely, 2^726743665 is an apocalyptic number.

It is an amenable number.

726743665 is a deficient number, since it is larger than the sum of its proper divisors (145348739).

726743665 is a wasteful number, since it uses less digits than its factorization.

726743665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145348738.

The product of its digits is 1270080, while the sum is 46.

The square root of 726743665 is about 26958.1836368847. The cubic root of 726743665 is about 899.0705074571.

The spelling of 726743665 in words is "seven hundred twenty-six million, seven hundred forty-three thousand, six hundred sixty-five".