722228643 has 10 divisors (see below), whose sum is σ = 1078884884. Its totient is φ = 481485708.

The previous prime is 722228569. The next prime is 722228657. The reversal of 722228643 is 346822227.

It is a happy number.

722228643 is a `hidden beast` number, since 7 + 2 + 2 + 2 + 2 + 8 + 643 = 666.

It is not a de Polignac number, because 722228643 - 2⁹ = 722228131 is a prime.

It is a super-2 number, since 2×722228643² = 1043228425539242898, 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 = 722228598 and 722228607.

It is not an unprimeable number, because it can be changed into a prime (722220643) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4458121 + ... + 4458282.

Almost surely, 2^722228643 is an apocalyptic number.

722228643 is a deficient number, since it is larger than the sum of its proper divisors (356656241).

722228643 is an equidigital number, since it uses as much as digits as its factorization.

722228643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8916415 (or 8916406 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 722228643 is about 26874.3119539831. The cubic root of 722228643 is about 897.2047608076.

The spelling of 722228643 in words is "seven hundred twenty-two million, two hundred twenty-eight thousand, six hundred forty-three".