665088 has 40 divisors (see below), whose sum is σ = 1775928. Its totient is φ = 221184.

The previous prime is 665069. The next prime is 665089. The reversal of 665088 is 880566.

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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320 + ... + 1752.

2⁶⁶⁵⁰⁸⁸ 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 665088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887964).

665088 is an abundant number, since it is smaller than the sum of its proper divisors (1110840).

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

665088 is an equidigital number, since it uses as much as digits as its factorization.

665088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 665088 is about 815.5292759920. The cubic root of 665088 is about 87.2890373557.

The spelling of 665088 in words is "six hundred sixty-five thousand, eighty-eight".