726606649 has 2 divisors, whose sum is σ = 726606650. Its totient is φ = 726606648.

The previous prime is 726606623. The next prime is 726606691. The reversal of 726606649 is 946606627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 705858624 + 20748025 = 26568^2 + 4555^2 .

It is an emirp because it is prime and its reverse (946606627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726606649 - 2²¹ = 724509497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 726606599 and 726606608.

It is not a weakly prime, because it can be changed into another prime (726676649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363303324 + 363303325.

It is an arithmetic number, because the mean of its divisors is an integer number (363303325).

Almost surely, 2^726606649 is an apocalyptic number.

It is an amenable number.

726606649 is a deficient number, since it is larger than the sum of its proper divisors (1).

726606649 is an equidigital number, since it uses as much as digits as its factorization.

726606649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 726606649 is about 26955.6422479599. The cubic root of 726606649 is about 899.0140020742.

The spelling of 726606649 in words is "seven hundred twenty-six million, six hundred six thousand, six hundred forty-nine".