667775 has 6 divisors (see below), whose sum is σ = 828072. Its totient is φ = 534200.

The previous prime is 667769. The next prime is 667781. The reversal of 667775 is 577766.

It is an interprime number because it is at equal distance from previous prime (667769) and next prime (667781).

It is not a de Polignac number, because 667775 - 2⁸ = 667519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667775.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13331 + ... + 13380.

It is an arithmetic number, because the mean of its divisors is an integer number (138012).

2⁶⁶⁷⁷⁷⁵ is an apocalyptic number.

667775 is a deficient number, since it is larger than the sum of its proper divisors (160297).

667775 is a wasteful number, since it uses less digits than its factorization.

667775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26721 (or 26716 counting only the distinct ones).

The product of its digits is 61740, while the sum is 38.

The square root of 667775 is about 817.1750118549. The cubic root of 667775 is about 87.4064305881.

Subtracting from 667775 its reverse (577766), we obtain a palindrome (90009).

The spelling of 667775 in words is "six hundred sixty-seven thousand, seven hundred seventy-five".