664814 has 8 divisors (see below), whose sum is σ = 1000728. Its totient is φ = 331240.

The previous prime is 664799. The next prime is 664843. The reversal of 664814 is 418466.

664814 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

664814 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, 644 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (125091).

2⁶⁶⁴⁸¹⁴ is an apocalyptic number.

664814 is a deficient number, since it is larger than the sum of its proper divisors (335914).

664814 is a wasteful number, since it uses less digits than its factorization.

664814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 4608, while the sum is 29.

The square root of 664814 is about 815.3612696222. The cubic root of 664814 is about 87.2770487259.

The spelling of 664814 in words is "six hundred sixty-four thousand, eight hundred fourteen".