667766 has 16 divisors (see below), whose sum is σ = 1105920. Its totient is φ = 299880.

The previous prime is 667753. The next prime is 667769.

667766 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×667766² = 891822861512, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667769) 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, 2675 + ... + 2913.

It is an arithmetic number, because the mean of its divisors is an integer number (69120).

2⁶⁶⁷⁷⁶⁶ is an apocalyptic number.

667766 is a deficient number, since it is larger than the sum of its proper divisors (438154).

667766 is a wasteful number, since it uses less digits than its factorization.

667766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its digits is 63504, while the sum is 38.

The square root of 667766 is about 817.1695050600. The cubic root of 667766 is about 87.4060379102.

The spelling of 667766 in words is "six hundred sixty-seven thousand, seven hundred sixty-six".