664630 has 8 divisors (see below), whose sum is σ = 1196352. Its totient is φ = 265848.

The previous prime is 664621. The next prime is 664633. The reversal of 664630 is 36466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 664595 and 664604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664633) by changing a digit.

664630 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 3 ways as a sum of consecutive naturals, for example, 33222 + ... + 33241.

It is an arithmetic number, because the mean of its divisors is an integer number (149544).

2⁶⁶⁴⁶³⁰ is an apocalyptic number.

664630 is a deficient number, since it is larger than the sum of its proper divisors (531722).

664630 is a wasteful number, since it uses less digits than its factorization.

664630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66470.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 664630 is about 815.2484283947. The cubic root of 664630 is about 87.2689961184.

The spelling of 664630 in words is "six hundred sixty-four thousand, six hundred thirty".