726820668 has 96 divisors (see below), whose sum is σ = 2223083520. Its totient is φ = 200957760.

The previous prime is 726820663. The next prime is 726820687. The reversal of 726820668 is 866028627.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726820663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7930 + ... + 38942.

It is an arithmetic number, because the mean of its divisors is an integer number (23157120).

Almost surely, 2^726820668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 726820668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111541760).

726820668 is an abundant number, since it is smaller than the sum of its proper divisors (1496262852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726820668 is a wasteful number, since it uses less digits than its factorization.

726820668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31064 (or 31056 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 726820668 is about 26959.6117924572. The cubic root of 726820668 is about 899.1022603684.

The spelling of 726820668 in words is "seven hundred twenty-six million, eight hundred twenty thousand, six hundred sixty-eight".