726625649 has 2 divisors, whose sum is σ = 726625650. Its totient is φ = 726625648.

The previous prime is 726625639. The next prime is 726625667. The reversal of 726625649 is 946526627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424978225 + 301647424 = 20615^2 + 17368^2 .

It is a cyclic number.

It is not a de Polignac number, because 726625649 - 2⁴ = 726625633 is a prime.

It is not a weakly prime, because it can be changed into another prime (726625639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363312824 + 363312825.

It is an arithmetic number, because the mean of its divisors is an integer number (363312825).

Almost surely, 2^726625649 is an apocalyptic number.

It is an amenable number.

726625649 is a deficient number, since it is larger than the sum of its proper divisors (1).

726625649 is an equidigital number, since it uses as much as digits as its factorization.

726625649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 47.

The square root of 726625649 is about 26955.9946765093. The cubic root of 726625649 is about 899.0218380963.

The spelling of 726625649 in words is "seven hundred twenty-six million, six hundred twenty-five thousand, six hundred forty-nine".