491831880 has 128 divisors (see below), whose sum is σ = 1546560000. Its totient is φ = 124959744.

The previous prime is 491831869. The next prime is 491831881. The reversal of 491831880 is 88138194.

It is not an unprimeable number, because it can be changed into a prime (491831881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274026 + ... + 275814.

It is an arithmetic number, because the mean of its divisors is an integer number (12082500).

Almost surely, 2^491831880 is an apocalyptic number.

491831880 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 491831880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773280000).

491831880 is an abundant number, since it is smaller than the sum of its proper divisors (1054728120).

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

491831880 is a wasteful number, since it uses less digits than its factorization.

491831880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 491831880 is about 22177.2829715455. The cubic root of 491831880 is about 789.3547473786.

The spelling of 491831880 in words is "four hundred ninety-one million, eight hundred thirty-one thousand, eight hundred eighty".