491218008 has 48 divisors (see below), whose sum is σ = 1271903880. Its totient is φ = 158086656.

The previous prime is 491217959. The next prime is 491218019. The reversal of 491218008 is 800812194.

It is a self number, because there is not a number n which added to its sum of digits gives 491218008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8016 + ... + 32352.

Almost surely, 2^491218008 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 491218008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (635951940).

491218008 is an abundant number, since it is smaller than the sum of its proper divisors (780685872).

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

491218008 is a wasteful number, since it uses less digits than its factorization.

491218008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24404 (or 24371 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 491218008 is about 22163.4385418870. The cubic root of 491218008 is about 789.0262038682.

The spelling of 491218008 in words is "four hundred ninety-one million, two hundred eighteen thousand, eight".