722166 has 16 divisors (see below), whose sum is σ = 1483824. Its totient is φ = 234144.

The previous prime is 722159. The next prime is 722167. The reversal of 722166 is 661227.

It is a happy number.

722166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722167) by changing a digit.

722166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (92739).

2⁷²²¹⁶⁶ is an apocalyptic number.

722166 is an abundant number, since it is smaller than the sum of its proper divisors (761658).

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

722166 is a wasteful number, since it uses less digits than its factorization.

722166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295.

The product of its digits is 1008, while the sum is 24.

The square root of 722166 is about 849.8035067002. The cubic root of 722166 is about 89.7178820166.

It can be divided in two parts, 722 and 166, that added together give a palindrome (888).

The spelling of 722166 in words is "seven hundred twenty-two thousand, one hundred sixty-six".