726691 has 4 divisors (see below), whose sum is σ = 830512. Its totient is φ = 622872.

The previous prime is 726689. The next prime is 726697. The reversal of 726691 is 196627.

726691 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 is a cyclic number.

It is not a de Polignac number, because 726691 - 2¹ = 726689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726697) 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, 51900 + ... + 51913.

It is an arithmetic number, because the mean of its divisors is an integer number (207628).

2⁷²⁶⁶⁹¹ is an apocalyptic number.

726691 is a deficient number, since it is larger than the sum of its proper divisors (103821).

726691 is a wasteful number, since it uses less digits than its factorization.

726691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103820.

The product of its digits is 4536, while the sum is 31.

The square root of 726691 is about 852.4617293463. The cubic root of 726691 is about 89.9048789257.

The spelling of 726691 in words is "seven hundred twenty-six thousand, six hundred ninety-one".