491664 has 20 divisors (see below), whose sum is σ = 1270256. Its totient is φ = 163872.

The previous prime is 491653. The next prime is 491669. The reversal of 491664 is 466194.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491664.

It is not an unprimeable number, because it can be changed into a prime (491669) by changing a digit.

491664 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, 5074 + ... + 5169.

2⁴⁹¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

491664 is an abundant number, since it is smaller than the sum of its proper divisors (778592).

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

491664 is a wasteful number, since it uses less digits than its factorization.

491664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10254 (or 10248 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 491664 is about 701.1875640654. The cubic root of 491664 is about 78.9264925388.

The spelling of 491664 in words is "four hundred ninety-one thousand, six hundred sixty-four".