665496 has 80 divisors (see below), whose sum is σ = 2032800. Its totient is φ = 202176.

The previous prime is 665479. The next prime is 665501. The reversal of 665496 is 694566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 665496.

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 665496.

It is an unprimeable number.

665496 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8385 + ... + 8463.

It is an arithmetic number, because the mean of its divisors is an integer number (25410).

2⁶⁶⁵⁴⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016400).

665496 is an abundant number, since it is smaller than the sum of its proper divisors (1367304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665496 is a wasteful number, since it uses less digits than its factorization.

665496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 97 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 665496 is about 815.7793819410. The cubic root of 665496 is about 87.3068829377.

The spelling of 665496 in words is "six hundred sixty-five thousand, four hundred ninety-six".