726845621 has 4 divisors (see below), whose sum is σ = 726907200. Its totient is φ = 726784044.

The previous prime is 726845611. The next prime is 726845653. The reversal of 726845621 is 126548627.

726845621 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726845621 is a prime.

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 (726845611) 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, 6911 + ... + 38748.

It is an arithmetic number, because the mean of its divisors is an integer number (181726800).

Almost surely, 2^726845621 is an apocalyptic number.

It is an amenable number.

726845621 is a deficient number, since it is larger than the sum of its proper divisors (61579).

726845621 is a wasteful number, since it uses less digits than its factorization.

726845621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61578.

The product of its digits is 161280, while the sum is 41.

The square root of 726845621 is about 26960.0745733390. The cubic root of 726845621 is about 899.1125494915.

The spelling of 726845621 in words is "seven hundred twenty-six million, eight hundred forty-five thousand, six hundred twenty-one".