726321290 has 8 divisors (see below), whose sum is σ = 1307378340. Its totient is φ = 290528512.

The previous prime is 726321283. The next prime is 726321293. The reversal of 726321290 is 92123627.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 628053721 + 98267569 = 25061^2 + 9913^2 .

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

It is not an unprimeable number, because it can be changed into a prime (726321293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36316055 + ... + 36316074.

Almost surely, 2^726321290 is an apocalyptic number.

726321290 is a deficient number, since it is larger than the sum of its proper divisors (581057050).

726321290 is a wasteful number, since it uses less digits than its factorization.

726321290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72632136.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 726321290 is about 26950.3486062797. The cubic root of 726321290 is about 898.8962972482.

The spelling of 726321290 in words is "seven hundred twenty-six million, three hundred twenty-one thousand, two hundred ninety".