726826661 has 8 divisors (see below), whose sum is σ = 794944800. Its totient is φ = 659049040.

The previous prime is 726826643. The next prime is 726826663. The reversal of 726826661 is 166628627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726826661 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 (726826663) 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 7 ways as a sum of consecutive naturals, for example, 80651 + ... + 89208.

It is an arithmetic number, because the mean of its divisors is an integer number (99368100).

Almost surely, 2^726826661 is an apocalyptic number.

It is an amenable number.

726826661 is a deficient number, since it is larger than the sum of its proper divisors (68118139).

726826661 is a wasteful number, since it uses less digits than its factorization.

726826661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170259.

The product of its digits is 290304, while the sum is 44.

The square root of 726826661 is about 26959.7229399710. The cubic root of 726826661 is about 899.1047315442.

The spelling of 726826661 in words is "seven hundred twenty-six million, eight hundred twenty-six thousand, six hundred sixty-one".