722320321 has 16 divisors (see below), whose sum is σ = 780753600. Its totient is φ = 666042048.

The previous prime is 722320289. The next prime is 722320343. The reversal of 722320321 is 123023227.

It is a cyclic number.

It is not a de Polignac number, because 722320321 - 2⁵ = 722320289 is a prime.

It is a super-2 number, since 2×722320321² = 1043493292259086082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 722320292 and 722320301.

It is not an unprimeable number, because it can be changed into a prime (722320381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257595 + ... + 260383.

It is an arithmetic number, because the mean of its divisors is an integer number (48797100).

Almost surely, 2^722320321 is an apocalyptic number.

It is an amenable number.

722320321 is a deficient number, since it is larger than the sum of its proper divisors (58433279).

722320321 is a wasteful number, since it uses less digits than its factorization.

722320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 722320321 is about 26876.0175807354. The cubic root of 722320321 is about 897.2427222199.

Adding to 722320321 its reverse (123023227), we get a palindrome (845343548).

The spelling of 722320321 in words is "seven hundred twenty-two million, three hundred twenty thousand, three hundred twenty-one".