726664907 has 4 divisors (see below), whose sum is σ = 736899696. Its totient is φ = 716430120.

The previous prime is 726664891. The next prime is 726664933. The reversal of 726664907 is 709466627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709466627 = 17 ⋅41733331.

It is a cyclic number.

It is not a de Polignac number, because 726664907 - 2⁴ = 726664891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726664987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5117288 + ... + 5117429.

It is an arithmetic number, because the mean of its divisors is an integer number (184224924).

Almost surely, 2^726664907 is an apocalyptic number.

726664907 is a deficient number, since it is larger than the sum of its proper divisors (10234789).

726664907 is a wasteful number, since it uses less digits than its factorization.

726664907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234788.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 726664907 is about 26956.7228534924. The cubic root of 726664907 is about 899.0380285348.

The spelling of 726664907 in words is "seven hundred twenty-six million, six hundred sixty-four thousand, nine hundred seven".