491567208 has 64 divisors (see below), whose sum is σ = 1360696320. Its totient is φ = 146731200.

The previous prime is 491567179. The next prime is 491567227. The reversal of 491567208 is 802765194.

It is a self number, because there is not a number n which added to its sum of digits gives 491567208.

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, 3793 + ... + 31583.

It is an arithmetic number, because the mean of its divisors is an integer number (21260880).

Almost surely, 2^491567208 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 491567208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680348160).

491567208 is an abundant number, since it is smaller than the sum of its proper divisors (869129112).

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

491567208 is a wasteful number, since it uses less digits than its factorization.

491567208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27878 (or 27874 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 491567208 is about 22171.3149812996. The cubic root of 491567208 is about 789.2131288058.

The spelling of 491567208 in words is "four hundred ninety-one million, five hundred sixty-seven thousand, two hundred eight".