491670664 has 32 divisors (see below), whose sum is σ = 953072640. Its totient is φ = 237789840.

The previous prime is 491670653. The next prime is 491670667. The reversal of 491670664 is 466076194.

It is a self number, because there is not a number n which added to its sum of digits gives 491670664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491670667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237297 + ... + 239359.

It is an arithmetic number, because the mean of its divisors is an integer number (29783520).

Almost surely, 2^491670664 is an apocalyptic number.

It is an amenable number.

491670664 is a deficient number, since it is larger than the sum of its proper divisors (461401976).

491670664 is an equidigital number, since it uses as much as digits as its factorization.

491670664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162 (or 2096 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 491670664 is about 22173.6479632919. The cubic root of 491670664 is about 789.2684912634.

The spelling of 491670664 in words is "four hundred ninety-one million, six hundred seventy thousand, six hundred sixty-four".