726699991 has 4 divisors (see below), whose sum is σ = 739017000. Its totient is φ = 714382984.

The previous prime is 726699989. The next prime is 726700061. The reversal of 726699991 is 199996627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 726699991 - 2¹ = 726699989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726699931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6158416 + ... + 6158533.

It is an arithmetic number, because the mean of its divisors is an integer number (184754250).

Almost surely, 2^726699991 is an apocalyptic number.

726699991 is a deficient number, since it is larger than the sum of its proper divisors (12317009).

726699991 is a wasteful number, since it uses less digits than its factorization.

726699991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12317008.

The product of its digits is 3306744, while the sum is 58.

The square root of 726699991 is about 26957.3735923958. The cubic root of 726699991 is about 899.0524970756.

The spelling of 726699991 in words is "seven hundred twenty-six million, six hundred ninety-nine thousand, nine hundred ninety-one".