722388689 has 8 divisors (see below), whose sum is σ = 792465120. Its totient is φ = 653046400.

The previous prime is 722388679. The next prime is 722388697. The reversal of 722388689 is 986883227.

722388689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722388689 - 2²⁸ = 453953233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 722388689.

It is not an unprimeable number, because it can be changed into a prime (722388679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181472 + ... + 185409.

It is an arithmetic number, because the mean of its divisors is an integer number (99058140).

Almost surely, 2^722388689 is an apocalyptic number.

It is an amenable number.

722388689 is a deficient number, since it is larger than the sum of its proper divisors (70076431).

722388689 is a wasteful number, since it uses less digits than its factorization.

722388689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367071.

The product of its digits is 2322432, while the sum is 53.

The square root of 722388689 is about 26877.2894652716. The cubic root of 722388689 is about 897.2710294927.

The spelling of 722388689 in words is "seven hundred twenty-two million, three hundred eighty-eight thousand, six hundred eighty-nine".