722640217 has 16 divisors (see below), whose sum is σ = 790110720. Its totient is φ = 656929152.

The previous prime is 722640169. The next prime is 722640227. The reversal of 722640217 is 712046227.

722640217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 722640217 - 2²⁷ = 588422489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722640227) 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, 326328 + ... + 328534.

It is an arithmetic number, because the mean of its divisors is an integer number (49381920).

Almost surely, 2^722640217 is an apocalyptic number.

It is an amenable number.

722640217 is a deficient number, since it is larger than the sum of its proper divisors (67470503).

722640217 is a wasteful number, since it uses less digits than its factorization.

722640217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 722640217 is about 26881.9682501114. The cubic root of 722640217 is about 897.3751574605.

The spelling of 722640217 in words is "seven hundred twenty-two million, six hundred forty thousand, two hundred seventeen".