491010660 has 336 divisors, whose sum is σ = 1877371776. Its totient is φ = 105255936.

The previous prime is 491010659. The next prime is 491010691. The reversal of 491010660 is 66010194.

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

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 111 ways as a sum of consecutive naturals, for example, 1734879 + ... + 1735161.

It is an arithmetic number, because the mean of its divisors is an integer number (5587416).

Almost surely, 2^491010660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491010660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938685888).

491010660 is an abundant number, since it is smaller than the sum of its proper divisors (1386361116).

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

491010660 is a wasteful number, since it uses less digits than its factorization.

491010660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 491010660 is about 22158.7603443875. The cubic root of 491010660 is about 788.9151696447.

The spelling of 491010660 in words is "four hundred ninety-one million, ten thousand, six hundred sixty".