668087 has 4 divisors (see below), whose sum is σ = 763536. Its totient is φ = 572640.

The previous prime is 668069. The next prime is 668089. The reversal of 668087 is 780866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780866 = 2 ⋅390433.

It is a cyclic number.

It is not a de Polignac number, because 668087 - 2¹² = 663991 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 668087.

It is not an unprimeable number, because it can be changed into a prime (668089) 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 3 ways as a sum of consecutive naturals, for example, 47714 + ... + 47727.

It is an arithmetic number, because the mean of its divisors is an integer number (190884).

2⁶⁶⁸⁰⁸⁷ is an apocalyptic number.

668087 is a deficient number, since it is larger than the sum of its proper divisors (95449).

668087 is an equidigital number, since it uses as much as digits as its factorization.

668087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95448.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 668087 is about 817.3658911406. The cubic root of 668087 is about 87.4200412405.

The spelling of 668087 in words is "six hundred sixty-eight thousand, eighty-seven".