491228280 has 256 divisors, whose sum is σ = 1772928000. Its totient is φ = 120559104.

The previous prime is 491228251. The next prime is 491228323. The reversal of 491228280 is 82822194.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 758917 + ... + 759563.

It is an arithmetic number, because the mean of its divisors is an integer number (6925500).

Almost surely, 2^491228280 is an apocalyptic number.

491228280 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 491228280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886464000).

491228280 is an abundant number, since it is smaller than the sum of its proper divisors (1281699720).

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

491228280 is a wasteful number, since it uses less digits than its factorization.

491228280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 491228280 is about 22163.6702736708. The cubic root of 491228280 is about 789.0317036806.

The spelling of 491228280 in words is "four hundred ninety-one million, two hundred twenty-eight thousand, two hundred eighty".