722618 has 8 divisors (see below), whose sum is σ = 1167348. Its totient is φ = 333504.

The previous prime is 722611. The next prime is 722633. The reversal of 722618 is 816227.

722618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 170569 = 743^2 + 413^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 27793 = 722618 / (7 + 2 + 2 + 6 + 1 + 8).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13871 + ... + 13922.

2⁷²²⁶¹⁸ is an apocalyptic number.

722618 is a deficient number, since it is larger than the sum of its proper divisors (444730).

722618 is a wasteful number, since it uses less digits than its factorization.

722618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27808.

The product of its digits is 1344, while the sum is 26.

The square root of 722618 is about 850.0694089308. The cubic root of 722618 is about 89.7365961004.

The spelling of 722618 in words is "seven hundred twenty-two thousand, six hundred eighteen".