491986824 has 64 divisors (see below), whose sum is σ = 1416806400. Its totient is φ = 139454784.

The previous prime is 491986819. The next prime is 491986877. The reversal of 491986824 is 428689194.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9807 + ... + 32865.

It is an arithmetic number, because the mean of its divisors is an integer number (22137600).

Almost surely, 2^491986824 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 491986824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708403200).

491986824 is an abundant number, since it is smaller than the sum of its proper divisors (924819576).

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

491986824 is a wasteful number, since it uses less digits than its factorization.

491986824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23202 (or 23198 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 491986824 is about 22180.7760008526. The cubic root of 491986824 is about 789.4376299961.

The spelling of 491986824 in words is "four hundred ninety-one million, nine hundred eighty-six thousand, eight hundred twenty-four".