726618731 has 8 divisors (see below), whose sum is σ = 742639104. Its totient is φ = 710621800.

The previous prime is 726618727. The next prime is 726618787. The reversal of 726618731 is 137816627.

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 726618731 - 2² = 726618727 is a prime.

It is a super-2 number, since 2×726618731² = 1055949560480100722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (722618731) 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 7 ways as a sum of consecutive naturals, for example, 66506 + ... + 76656.

It is an arithmetic number, because the mean of its divisors is an integer number (92829888).

Almost surely, 2^726618731 is an apocalyptic number.

726618731 is a deficient number, since it is larger than the sum of its proper divisors (16020373).

726618731 is a wasteful number, since it uses less digits than its factorization.

726618731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11721.

The product of its digits is 84672, while the sum is 41.

The square root of 726618731 is about 26955.8663559530. The cubic root of 726618731 is about 899.0189849752.

The spelling of 726618731 in words is "seven hundred twenty-six million, six hundred eighteen thousand, seven hundred thirty-one".