491333568 has 84 divisors (see below), whose sum is σ = 1428978600. Its totient is φ = 148881920.

The previous prime is 491333543. The next prime is 491333593. The reversal of 491333568 is 865333194.

It is an interprime number because it is at equal distance from previous prime (491333543) and next prime (491333593).

It is a super-2 number, since 2×491333568² = 482817350087221248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 12658 + ... + 33806.

It is an arithmetic number, because the mean of its divisors is an integer number (17011650).

Almost surely, 2^491333568 is an apocalyptic number.

491333568 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491333568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714489300).

491333568 is an abundant number, since it is smaller than the sum of its proper divisors (937645032).

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

491333568 is a wasteful number, since it uses less digits than its factorization.

491333568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21186 (or 21165 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 491333568 is about 22166.0453847771. The cubic root of 491333568 is about 789.0880723377.

The spelling of 491333568 in words is "four hundred ninety-one million, three hundred thirty-three thousand, five hundred sixty-eight".