491663760 has 320 divisors, whose sum is σ = 1867499520. Its totient is φ = 104509440.

The previous prime is 491663729. The next prime is 491663771. The reversal of 491663760 is 67366194.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2330055 + ... + 2330265.

It is an arithmetic number, because the mean of its divisors is an integer number (5835936).

Almost surely, 2^491663760 is an apocalyptic number.

491663760 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 491663760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933749760).

491663760 is an abundant number, since it is smaller than the sum of its proper divisors (1375835760).

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

491663760 is a wasteful number, since it uses less digits than its factorization.

491663760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 491663760 is about 22173.4922824529. The cubic root of 491663760 is about 789.2647969645.

The spelling of 491663760 in words is "four hundred ninety-one million, six hundred sixty-three thousand, seven hundred sixty".