491275660 has 48 divisors (see below), whose sum is σ = 1070768160. Its totient is φ = 189109760.

The previous prime is 491275651. The next prime is 491275661. The reversal of 491275660 is 66572194.

It is not an unprimeable number, because it can be changed into a prime (491275661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200040 + ... + 202480.

It is an arithmetic number, because the mean of its divisors is an integer number (22307670).

Almost surely, 2^491275660 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 491275660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535384080).

491275660 is an abundant number, since it is smaller than the sum of its proper divisors (579492500).

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

491275660 is a wasteful number, since it uses less digits than its factorization.

491275660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2824 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 491275660 is about 22164.7391141877. The cubic root of 491275660 is about 789.0570707871.

The spelling of 491275660 in words is "four hundred ninety-one million, two hundred seventy-five thousand, six hundred sixty".