491920104 has 64 divisors (see below), whose sum is σ = 1346163840. Its totient is φ = 148872960.

The previous prime is 491920087. The next prime is 491920141. The reversal of 491920104 is 401029194.

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, 6109 + ... + 31955.

It is an arithmetic number, because the mean of its divisors is an integer number (21033810).

Almost surely, 2^491920104 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 491920104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673081920).

491920104 is an abundant number, since it is smaller than the sum of its proper divisors (854243736).

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

491920104 is a wasteful number, since it uses less digits than its factorization.

491920104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25930 (or 25926 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 491920104 is about 22179.2719447686. The cubic root of 491920104 is about 789.4019422789.

Adding to 491920104 its reverse (401029194), we get a palindrome (892949298).

The spelling of 491920104 in words is "four hundred ninety-one million, nine hundred twenty thousand, one hundred four".