721713244 has 12 divisors (see below), whose sum is σ = 1443426544. Its totient is φ = 309305664.

The previous prime is 721713241. The next prime is 721713287. The reversal of 721713244 is 442317127.

721713244 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721713241) 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, 12887709 + ... + 12887764.

Almost surely, 2^721713244 is an apocalyptic number.

It is an amenable number.

721713244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721713244 is a wasteful number, since it uses less digits than its factorization.

721713244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775484 (or 25775482 counting only the distinct ones).

The product of its digits is 9408, while the sum is 31.

The square root of 721713244 is about 26864.7211785271. The cubic root of 721713244 is about 896.9912880234.

The spelling of 721713244 in words is "seven hundred twenty-one million, seven hundred thirteen thousand, two hundred forty-four".