664654 has 8 divisors (see below), whose sum is σ = 1040400. Its totient is φ = 317856.

The previous prime is 664633. The next prime is 664661. The reversal of 664654 is 456466.

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

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, 7179 + ... + 7270.

It is an arithmetic number, because the mean of its divisors is an integer number (130050).

2⁶⁶⁴⁶⁵⁴ is an apocalyptic number.

664654 is a deficient number, since it is larger than the sum of its proper divisors (375746).

664654 is a wasteful number, since it uses less digits than its factorization.

664654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14474.

The product of its digits is 17280, while the sum is 31.

The square root of 664654 is about 815.2631477014. The cubic root of 664654 is about 87.2700465428.

The spelling of 664654 in words is "six hundred sixty-four thousand, six hundred fifty-four".