491178168 has 160 divisors (see below), whose sum is σ = 1494108000. Its totient is φ = 149859072.

The previous prime is 491178151. The next prime is 491178199. The reversal of 491178168 is 861871194.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1676230 + ... + 1676522.

It is an arithmetic number, because the mean of its divisors is an integer number (9338175).

Almost surely, 2^491178168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491178168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747054000).

491178168 is an abundant number, since it is smaller than the sum of its proper divisors (1002929832).

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

491178168 is a wasteful number, since it uses less digits than its factorization.

491178168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 510 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 491178168 is about 22162.5397461573. The cubic root of 491178168 is about 789.0048720947.

The spelling of 491178168 in words is "four hundred ninety-one million, one hundred seventy-eight thousand, one hundred sixty-eight".