491308520 has 64 divisors (see below), whose sum is σ = 1159902720. Its totient is φ = 186937344.

The previous prime is 491308511. The next prime is 491308523. The reversal of 491308520 is 25803194.

It is not an unprimeable number, because it can be changed into a prime (491308523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176177 + ... + 178943.

It is an arithmetic number, because the mean of its divisors is an integer number (18123480).

Almost surely, 2^491308520 is an apocalyptic number.

491308520 is a gapful number since it is divisible by the number (40) 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 491308520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579951360).

491308520 is an abundant number, since it is smaller than the sum of its proper divisors (668594200).

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

491308520 is a wasteful number, since it uses less digits than its factorization.

491308520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994 (or 2990 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 491308520 is about 22165.4803692589. The cubic root of 491308520 is about 789.0746629723.

The spelling of 491308520 in words is "four hundred ninety-one million, three hundred eight thousand, five hundred twenty".