664996 has 12 divisors (see below), whose sum is σ = 1178352. Its totient is φ = 328328.

The previous prime is 664973. The next prime is 664997. The reversal of 664996 is 699466.

664996 is a modest number, since divided by 996 gives 664 as remainder.

It is not an unprimeable number, because it can be changed into a prime (664997) by changing a digit.

664996 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, 670 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (98196).

2⁶⁶⁴⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

664996 is a deficient number, since it is larger than the sum of its proper divisors (513356).

664996 is a wasteful number, since it uses less digits than its factorization.

664996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 2088 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 664996 is about 815.4728689540. The cubic root of 664996 is about 87.2850123436.

The spelling of 664996 in words is "six hundred sixty-four thousand, nine hundred ninety-six".