665344 has 36 divisors (see below), whose sum is σ = 1398096. Its totient is φ = 315392.

The previous prime is 665311. The next prime is 665351. The reversal of 665344 is 443566.

665344 = T₄₇ + T₄₈ + ... + T₁₅₉.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5832 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (38836).

2⁶⁶⁵³⁴⁴ is an apocalyptic number.

665344 is a gapful number since it is divisible by the number (64) 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 665344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699048).

665344 is an abundant number, since it is smaller than the sum of its proper divisors (732752).

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

665344 is a wasteful number, since it uses less digits than its factorization.

665344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 138 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 665344 is about 815.6862141780. The cubic root of 665344 is about 87.3002354363.

The spelling of 665344 in words is "six hundred sixty-five thousand, three hundred forty-four".