665087 has 4 divisors (see below), whose sum is σ = 670296. Its totient is φ = 659880.

The previous prime is 665069. The next prime is 665089. The reversal of 665087 is 780566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665087 - 2¹⁶ = 599551 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 (665089) 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, 2408 + ... + 2669.

It is an arithmetic number, because the mean of its divisors is an integer number (167574).

2⁶⁶⁵⁰⁸⁷ is an apocalyptic number.

665087 is a deficient number, since it is larger than the sum of its proper divisors (5209).

665087 is a wasteful number, since it uses less digits than its factorization.

665087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 665087 is about 815.5286628930. The cubic root of 665087 is about 87.2889936076.

The spelling of 665087 in words is "six hundred sixty-five thousand, eighty-seven".