721089244 has 6 divisors (see below), whose sum is σ = 1261906184. Its totient is φ = 360544620.

The previous prime is 721089217. The next prime is 721089247. The reversal of 721089244 is 442980127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721089247) 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 as a sum of consecutive naturals, namely, 90136152 + ... + 90136159.

Almost surely, 2^721089244 is an apocalyptic number.

It is an amenable number.

721089244 is a deficient number, since it is larger than the sum of its proper divisors (540816940).

721089244 is a wasteful number, since it uses less digits than its factorization.

721089244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180272315 (or 180272313 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 721089244 is about 26853.1049228949. The cubic root of 721089244 is about 896.7326978056.

The spelling of 721089244 in words is "seven hundred twenty-one million, eighty-nine thousand, two hundred forty-four".