726815861 has 8 divisors (see below), whose sum is σ = 729699840. Its totient is φ = 723938608.

The previous prime is 726815851. The next prime is 726815923. The reversal of 726815861 is 168518627.

It is a happy number.

726815861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 726815861 - 2¹⁴ = 726799477 is a prime.

It is a super-2 number, since 2×726815861² = 1056522591602342642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726815851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328220 + ... + 330426.

It is an arithmetic number, because the mean of its divisors is an integer number (91212480).

Almost surely, 2^726815861 is an apocalyptic number.

It is an amenable number.

726815861 is a deficient number, since it is larger than the sum of its proper divisors (2883979).

726815861 is a wasteful number, since it uses less digits than its factorization.

726815861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363.

The product of its digits is 161280, while the sum is 44.

The square root of 726815861 is about 26959.5226404326. The cubic root of 726815861 is about 899.1002782223.

The spelling of 726815861 in words is "seven hundred twenty-six million, eight hundred fifteen thousand, eight hundred sixty-one".