664916 has 12 divisors (see below), whose sum is σ = 1329888. Its totient is φ = 284952.

The previous prime is 664891. The next prime is 664933. The reversal of 664916 is 619466.

664916 is an admirable number.

It is a super-2 number, since 2×664916² = 884226574112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 664916.

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, 11846 + ... + 11901.

It is an arithmetic number, because the mean of its divisors is an integer number (110824).

2⁶⁶⁴⁹¹⁶ is an apocalyptic number.

It is an amenable number.

664916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664916 is a wasteful number, since it uses less digits than its factorization.

664916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23758 (or 23756 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 664916 is about 815.4238161840. The cubic root of 664916 is about 87.2815120313.

The spelling of 664916 in words is "six hundred sixty-four thousand, nine hundred sixteen".