726725991 has 8 divisors (see below), whose sum is σ = 995156464. Its totient is φ = 471389760.

The previous prime is 726725981. The next prime is 726726059. The reversal of 726725991 is 199527627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 726725991 - 2¹⁸ = 726463847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 726725991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726725941) 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, 3273430 + ... + 3273651.

It is an arithmetic number, because the mean of its divisors is an integer number (124394558).

Almost surely, 2^726725991 is an apocalyptic number.

726725991 is a deficient number, since it is larger than the sum of its proper divisors (268430473).

726725991 is a wasteful number, since it uses less digits than its factorization.

726725991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547121.

The product of its digits is 476280, while the sum is 48.

The square root of 726725991 is about 26957.8558309076. The cubic root of 726725991 is about 899.0632191005.

The spelling of 726725991 in words is "seven hundred twenty-six million, seven hundred twenty-five thousand, nine hundred ninety-one".