722228018 has 18 divisors (see below), whose sum is σ = 1121244957. Its totient is φ = 348895080.

The previous prime is 722228011. The next prime is 722228029. The reversal of 722228018 is 810822227.

It can be written as a sum of positive squares in 2 ways, for example, as 402283249 + 319944769 = 20057^2 + 17887^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=19003.

It is a super-2 number, since 2×722228018² = 1043226619968416648, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722228011) 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 8 ways as a sum of consecutive naturals, for example, 1177880 + ... + 1178492.

Almost surely, 2^722228018 is an apocalyptic number.

722228018 is a deficient number, since it is larger than the sum of its proper divisors (399016939).

722228018 is an frugal number, since it uses more digits than its factorization.

722228018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 722228018 is about 26874.3003257759. The cubic root of 722228018 is about 897.2045020007.

Multiplying 722228018 by its sum of digits (32), we get a square (23111296576 = 152024²).

The spelling of 722228018 in words is "seven hundred twenty-two million, two hundred twenty-eight thousand, eighteen".