722728219 has 4 divisors (see below), whose sum is σ = 739535896. Its totient is φ = 705920544.

The previous prime is 722728211. The next prime is 722728231. The reversal of 722728219 is 912827227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912827227 = 13 ⋅70217479.

It is a cyclic number.

It is not a de Polignac number, because 722728219 - 2³ = 722728211 is a prime.

It is a super-2 number, since 2×722728219² = 1044672157077823922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722728211) 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 in 3 ways as a sum of consecutive naturals, for example, 8403774 + ... + 8403859.

It is an arithmetic number, because the mean of its divisors is an integer number (184883974).

Almost surely, 2^722728219 is an apocalyptic number.

722728219 is a deficient number, since it is larger than the sum of its proper divisors (16807677).

722728219 is a wasteful number, since it uses less digits than its factorization.

722728219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16807676.

The product of its digits is 56448, while the sum is 40.

The square root of 722728219 is about 26883.6050223924. The cubic root of 722728219 is about 897.4115829649.

The spelling of 722728219 in words is "seven hundred twenty-two million, seven hundred twenty-eight thousand, two hundred nineteen".