666287 has 8 divisors (see below), whose sum is σ = 708480. Its totient is φ = 625240.

The previous prime is 666277. The next prime is 666301. The reversal of 666287 is 782666.

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 666287 - 2⁸ = 666031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666277) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1112 + ... + 1602.

It is an arithmetic number, because the mean of its divisors is an integer number (88560).

2⁶⁶⁶²⁸⁷ is an apocalyptic number.

666287 is a deficient number, since it is larger than the sum of its proper divisors (42193).

666287 is a wasteful number, since it uses less digits than its factorization.

666287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its digits is 24192, while the sum is 35.

The square root of 666287 is about 816.2640504151. The cubic root of 666287 is about 87.3414598554.

The spelling of 666287 in words is "six hundred sixty-six thousand, two hundred eighty-seven".