726887809 has 4 divisors (see below), whose sum is σ = 734084820. Its totient is φ = 719690800.

The previous prime is 726887801. The next prime is 726887849. The reversal of 726887809 is 908788627.

726887809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 583367409 + 143520400 = 24153^2 + 11980^2 .

It is a cyclic number.

It is not a de Polignac number, because 726887809 - 2³ = 726887801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 726887809.

It is not an unprimeable number, because it can be changed into a prime (726887801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3598354 + ... + 3598555.

It is an arithmetic number, because the mean of its divisors is an integer number (183521205).

Almost surely, 2^726887809 is an apocalyptic number.

It is an amenable number.

726887809 is a deficient number, since it is larger than the sum of its proper divisors (7197011).

726887809 is a wasteful number, since it uses less digits than its factorization.

726887809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7197010.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The square root of 726887809 is about 26960.8569782194. The cubic root of 726887809 is about 899.1299447609.

The spelling of 726887809 in words is "seven hundred twenty-six million, eight hundred eighty-seven thousand, eight hundred nine".