667281 has 8 divisors (see below), whose sum is σ = 893664. Its totient is φ = 442880.

The previous prime is 667273. The next prime is 667283. The reversal of 667281 is 182766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667281 - 2³ = 667273 is a prime.

It is a super-2 number, since 2×667281² = 890527865922, which contains 22 as substring.

It is a Curzon number.

667281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (667283) 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, 721 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (111708).

2⁶⁶⁷²⁸¹ is an apocalyptic number.

It is an amenable number.

667281 is a deficient number, since it is larger than the sum of its proper divisors (226383).

667281 is a wasteful number, since it uses less digits than its factorization.

667281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its digits is 4032, while the sum is 30.

The square root of 667281 is about 816.8726951000. The cubic root of 667281 is about 87.3848717154.

The spelling of 667281 in words is "six hundred sixty-seven thousand, two hundred eighty-one".