667726 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 305920.

The previous prime is 667699. The next prime is 667727. The reversal of 667726 is 627766.

It is a super-2 number, since 2×667726² = 891716022152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 667691 and 667700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667727) 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, 1155 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁶⁶⁷⁷²⁶ is an apocalyptic number.

667726 is a deficient number, since it is larger than the sum of its proper divisors (420914).

667726 is a wasteful number, since it uses less digits than its factorization.

667726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its digits is 21168, while the sum is 34.

The square root of 667726 is about 817.1450299671. The cubic root of 667726 is about 87.4042926325.

The spelling of 667726 in words is "six hundred sixty-seven thousand, seven hundred twenty-six".