491633280 has 256 divisors, whose sum is σ = 1818374400. Its totient is φ = 125300736.

The previous prime is 491633267. The next prime is 491633291. The reversal of 491633280 is 82336194.

491633280 is a `hidden beast` number, since 491 + 63 + 32 + 80 = 666.

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 31 ways as a sum of consecutive naturals, for example, 396822 + ... + 398058.

It is an arithmetic number, because the mean of its divisors is an integer number (7103025).

Almost surely, 2^491633280 is an apocalyptic number.

491633280 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 491633280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909187200).

491633280 is an abundant number, since it is smaller than the sum of its proper divisors (1326741120).

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

491633280 is a wasteful number, since it uses less digits than its factorization.

491633280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 491633280 is about 22172.8049646408. The cubic root of 491633280 is about 789.2484868422.

The spelling of 491633280 in words is "four hundred ninety-one million, six hundred thirty-three thousand, two hundred eighty".