491843664 has 240 divisors, whose sum is σ = 1584815232. Its totient is φ = 146686464.

The previous prime is 491843659. The next prime is 491843713. The reversal of 491843664 is 466348194.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1869997 + ... + 1870259.

Almost surely, 2^491843664 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 491843664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792407616).

491843664 is an abundant number, since it is smaller than the sum of its proper divisors (1092971568).

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

491843664 is a wasteful number, since it uses less digits than its factorization.

491843664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 318 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 491843664 is about 22177.5486472243. The cubic root of 491843664 is about 789.3610514853.

The spelling of 491843664 in words is "four hundred ninety-one million, eight hundred forty-three thousand, six hundred sixty-four".