664694 has 16 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 316680.

The previous prime is 664693. The next prime is 664711. The reversal of 664694 is 496466.

It is a super-2 number, since 2×664694² = 883636227272, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664694.

It is not an unprimeable number, because it can be changed into a prime (664691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5009 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (65340).

2⁶⁶⁴⁶⁹⁴ is an apocalyptic number.

664694 is a deficient number, since it is larger than the sum of its proper divisors (380746).

664694 is a wasteful number, since it uses less digits than its factorization.

664694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235.

The product of its digits is 31104, while the sum is 35.

The square root of 664694 is about 815.2876792887. The cubic root of 664694 is about 87.2717971939.

The spelling of 664694 in words is "six hundred sixty-four thousand, six hundred ninety-four".