491937280 has 80 divisors (see below), whose sum is σ = 1199856240. Its totient is φ = 193380352.

The previous prime is 491937253. The next prime is 491937289. The reversal of 491937280 is 82739194.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491937289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149412 + ... + 152668.

It is an arithmetic number, because the mean of its divisors is an integer number (14998203).

Almost surely, 2^491937280 is an apocalyptic number.

491937280 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 491937280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599928120).

491937280 is an abundant number, since it is smaller than the sum of its proper divisors (707918960).

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

491937280 is an equidigital number, since it uses as much as digits as its factorization.

491937280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339 (or 3323 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 491937280 is about 22179.6591497705. The cubic root of 491937280 is about 789.4111298210.

The spelling of 491937280 in words is "four hundred ninety-one million, nine hundred thirty-seven thousand, two hundred eighty".