491738208 has 96 divisors (see below), whose sum is σ = 1395324000. Its totient is φ = 150736896.

The previous prime is 491738207. The next prime is 491738257. The reversal of 491738208 is 802837194.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 491738208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491738207) 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, 434988 + ... + 436116.

It is an arithmetic number, because the mean of its divisors is an integer number (14534625).

Almost surely, 2^491738208 is an apocalyptic number.

491738208 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 491738208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697662000).

491738208 is an abundant number, since it is smaller than the sum of its proper divisors (903585792).

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

491738208 is a wasteful number, since it uses less digits than its factorization.

491738208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 491738208 is about 22175.1709801751. The cubic root of 491738208 is about 789.3046319255.

The spelling of 491738208 in words is "four hundred ninety-one million, seven hundred thirty-eight thousand, two hundred eight".