491201280 has 288 divisors, whose sum is σ = 1779261120. Its totient is φ = 128286720.

The previous prime is 491201267. The next prime is 491201287. The reversal of 491201280 is 82102194.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (491201287) 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, 2108044 + ... + 2108276.

It is an arithmetic number, because the mean of its divisors is an integer number (6177990).

Almost surely, 2^491201280 is an apocalyptic number.

491201280 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 491201280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889630560).

491201280 is an abundant number, since it is smaller than the sum of its proper divisors (1288059840).

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

491201280 is a wasteful number, since it uses less digits than its factorization.

491201280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 491201280 is about 22163.0611604083. The cubic root of 491201280 is about 789.0172472339.

The spelling of 491201280 in words is "four hundred ninety-one million, two hundred one thousand, two hundred eighty".