665630 has 32 divisors (see below), whose sum is σ = 1411776. Its totient is φ = 221184.

The previous prime is 665629. The next prime is 665633. The reversal of 665630 is 36566.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 665630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665633) 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, 2462 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (44118).

2⁶⁶⁵⁶³⁰ is an apocalyptic number.

665630 is an abundant number, since it is smaller than the sum of its proper divisors (746146).

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

665630 is a wasteful number, since it uses less digits than its factorization.

665630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 665630 is about 815.8615078553. The cubic root of 665630 is about 87.3127423955.

The spelling of 665630 in words is "six hundred sixty-five thousand, six hundred thirty".