726623731 has 4 divisors (see below), whose sum is σ = 726798600. Its totient is φ = 726448864.

The previous prime is 726623717. The next prime is 726623743. The reversal of 726623731 is 137326627.

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 726623731 - 2⁵ = 726623699 is a prime.

It is a super-2 number, since 2×726623731² = 1055964092904720722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726626731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81046 + ... + 89563.

It is an arithmetic number, because the mean of its divisors is an integer number (181699650).

Almost surely, 2^726623731 is an apocalyptic number.

726623731 is a deficient number, since it is larger than the sum of its proper divisors (174869).

726623731 is a wasteful number, since it uses less digits than its factorization.

726623731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174868.

The product of its digits is 63504, while the sum is 37.

The square root of 726623731 is about 26955.9590999838. The cubic root of 726623731 is about 899.0210470767.

The spelling of 726623731 in words is "seven hundred twenty-six million, six hundred twenty-three thousand, seven hundred thirty-one".