491935668 has 24 divisors (see below), whose sum is σ = 1311828672. Its totient is φ = 140553024.

The previous prime is 491935667. The next prime is 491935673. The reversal of 491935668 is 866539194.

It is a self number, because there is not a number n which added to its sum of digits gives 491935668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491935667) 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, 2928105 + ... + 2928272.

It is an arithmetic number, because the mean of its divisors is an integer number (54659528).

Almost surely, 2^491935668 is an apocalyptic number.

It is an amenable number.

491935668 is an abundant number, since it is smaller than the sum of its proper divisors (819893004).

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

491935668 is a wasteful number, since it uses less digits than its factorization.

491935668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856391 (or 5856389 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 491935668 is about 22179.6228101381. The cubic root of 491935668 is about 789.4102675619.

The spelling of 491935668 in words is "four hundred ninety-one million, nine hundred thirty-five thousand, six hundred sixty-eight".