726220646 has 4 divisors (see below), whose sum is σ = 1089330972. Its totient is φ = 363110322.

The previous prime is 726220643. The next prime is 726220657. The reversal of 726220646 is 646022627.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726220643) 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 as a sum of consecutive naturals, namely, 181555160 + ... + 181555163.

It is an arithmetic number, because the mean of its divisors is an integer number (272332743).

Almost surely, 2^726220646 is an apocalyptic number.

726220646 is a deficient number, since it is larger than the sum of its proper divisors (363110326).

726220646 is a wasteful number, since it uses less digits than its factorization.

726220646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363110325.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 726220646 is about 26948.4813301232. The cubic root of 726220646 is about 898.8547762762.

The spelling of 726220646 in words is "seven hundred twenty-six million, two hundred twenty thousand, six hundred forty-six".