726196621 has 8 divisors (see below), whose sum is σ = 729960824. Its totient is φ = 722442240.

The previous prime is 726196589. The next prime is 726196637. The reversal of 726196621 is 126691627.

It can be written as a sum of positive squares in 4 ways, for example, as 10634121 + 715562500 = 3261^2 + 26750^2 .

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 726196621 - 2⁵ = 726196589 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 (726196651) 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, 178591 + ... + 182611.

It is an arithmetic number, because the mean of its divisors is an integer number (91245103).

Almost surely, 2^726196621 is an apocalyptic number.

It is an amenable number.

726196621 is a deficient number, since it is larger than the sum of its proper divisors (3764203).

726196621 is a wasteful number, since it uses less digits than its factorization.

726196621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911.

The product of its digits is 54432, while the sum is 40.

The square root of 726196621 is about 26948.0355684788. The cubic root of 726196621 is about 898.8448641261.

The spelling of 726196621 in words is "seven hundred twenty-six million, one hundred ninety-six thousand, six hundred twenty-one".