721660222 has 8 divisors (see below), whose sum is σ = 1117409472. Its totient is φ = 349190400.

The previous prime is 721660207. The next prime is 721660249. The reversal of 721660222 is 222066127.

721660222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5819779 + ... + 5819902.

It is an arithmetic number, because the mean of its divisors is an integer number (139676184).

Almost surely, 2^721660222 is an apocalyptic number.

721660222 is a deficient number, since it is larger than the sum of its proper divisors (395749250).

721660222 is a wasteful number, since it uses less digits than its factorization.

721660222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11639714.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 721660222 is about 26863.7343271556. The cubic root of 721660222 is about 896.9693211101.

The spelling of 721660222 in words is "seven hundred twenty-one million, six hundred sixty thousand, two hundred twenty-two".