726638718 has 64 divisors (see below), whose sum is σ = 1682069760. Its totient is φ = 207263232.

The previous prime is 726638713. The next prime is 726638719. The reversal of 726638718 is 817836627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726638711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84753 + ... + 92931.

It is an arithmetic number, because the mean of its divisors is an integer number (26282340).

Almost surely, 2^726638718 is an apocalyptic number.

726638718 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 726638718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841034880).

726638718 is an abundant number, since it is smaller than the sum of its proper divisors (955431042).

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

726638718 is a wasteful number, since it uses less digits than its factorization.

726638718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8281.

The product of its digits is 677376, while the sum is 48.

The square root of 726638718 is about 26956.2370890301. The cubic root of 726638718 is about 899.0272279629.

The spelling of 726638718 in words is "seven hundred twenty-six million, six hundred thirty-eight thousand, seven hundred eighteen".