726666317 has 8 divisors (see below), whose sum is σ = 782822040. Its totient is φ = 670547520.

The previous prime is 726666293. The next prime is 726666323. The reversal of 726666317 is 713666627.

It can be written as a sum of positive squares in 4 ways, for example, as 45508516 + 681157801 = 6746^2 + 26099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 726666317 - 2¹⁰ = 726665293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726666617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42359 + ... + 56987.

It is an arithmetic number, because the mean of its divisors is an integer number (97852755).

Almost surely, 2^726666317 is an apocalyptic number.

It is an amenable number.

726666317 is a deficient number, since it is larger than the sum of its proper divisors (56155723).

726666317 is a wasteful number, since it uses less digits than its factorization.

726666317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18463.

The product of its digits is 381024, while the sum is 44.

The square root of 726666317 is about 26956.7490065104. The cubic root of 726666317 is about 899.0386100238.

The spelling of 726666317 in words is "seven hundred twenty-six million, six hundred sixty-six thousand, three hundred seventeen".