667567 has 4 divisors (see below), whose sum is σ = 669240. Its totient is φ = 665896.

The previous prime is 667561. The next prime is 667577. The reversal of 667567 is 765766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 765766 = 2 ⋅382883.

It is a cyclic number.

It is not a de Polignac number, because 667567 - 2³ = 667559 is a prime.

It is a super-4 number, since 4×667567⁴ (a number of 24 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (167310).

2⁶⁶⁷⁵⁶⁷ is an apocalyptic number.

667567 is a deficient number, since it is larger than the sum of its proper divisors (1673).

667567 is a wasteful number, since it uses less digits than its factorization.

667567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its digits is 52920, while the sum is 37.

The square root of 667567 is about 817.0477342236. The cubic root of 667567 is about 87.3973544644.

The spelling of 667567 in words is "six hundred sixty-seven thousand, five hundred sixty-seven".