665448 has 64 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 178176.

The previous prime is 665447. The next prime is 665479. The reversal of 665448 is 844566.

It is a happy number.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2740 + ... + 2972.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2⁶⁶⁵⁴⁴⁸ is an apocalyptic number.

665448 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010880).

665448 is an abundant number, since it is smaller than the sum of its proper divisors (1356312).

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

665448 is a wasteful number, since it uses less digits than its factorization.

665448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 262 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 665448 is about 815.7499616917. The cubic root of 665448 is about 87.3047838361.

The spelling of 665448 in words is "six hundred sixty-five thousand, four hundred forty-eight".