722658 has 16 divisors (see below), whose sum is σ = 1479456. Its totient is φ = 235200.

The previous prime is 722639. The next prime is 722663. The reversal of 722658 is 856227.

722658 is nontrivially palindromic in base 7.

It is a d-powerful number, because it can be written as 7⁶ + 2¹¹ + 6² + 2¹⁹ + 5⁷ + 8³ .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1143 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (92466).

2⁷²²⁶⁵⁸ is an apocalyptic number.

722658 is an abundant number, since it is smaller than the sum of its proper divisors (756798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

722658 is a wasteful number, since it uses less digits than its factorization.

722658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849.

The product of its digits is 6720, while the sum is 30.

The square root of 722658 is about 850.0929360958. The cubic root of 722658 is about 89.7382518381.

The spelling of 722658 in words is "seven hundred twenty-two thousand, six hundred fifty-eight".