667722 has 32 divisors (see below), whose sum is σ = 1488384. Its totient is φ = 198000.

The previous prime is 667699. The next prime is 667727. The reversal of 667722 is 227766.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 667722.

It is not an unprimeable number, because it can be changed into a prime (667727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4347 + ... + 4497.

It is an arithmetic number, because the mean of its divisors is an integer number (46512).

2⁶⁶⁷⁷²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744192).

667722 is an abundant number, since it is smaller than the sum of its proper divisors (820662).

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

667722 is a wasteful number, since it uses less digits than its factorization.

667722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234.

The product of its digits is 7056, while the sum is 30.

The square root of 667722 is about 817.1425824175. The cubic root of 667722 is about 87.4041181009.

The spelling of 667722 in words is "six hundred sixty-seven thousand, seven hundred twenty-two".