665487 has 6 divisors (see below), whose sum is σ = 961272. Its totient is φ = 443652.

The previous prime is 665479. The next prime is 665501. The reversal of 665487 is 784566.

It is a happy number.

It is not a de Polignac number, because 665487 - 2³ = 665479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665447) 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 5 ways as a sum of consecutive naturals, for example, 36963 + ... + 36980.

It is an arithmetic number, because the mean of its divisors is an integer number (160212).

2⁶⁶⁵⁴⁸⁷ is an apocalyptic number.

665487 is a deficient number, since it is larger than the sum of its proper divisors (295785).

665487 is a wasteful number, since it uses less digits than its factorization.

665487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73949 (or 73946 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 665487 is about 815.7738657251. The cubic root of 665487 is about 87.3064893638.

The spelling of 665487 in words is "six hundred sixty-five thousand, four hundred eighty-seven".