491163264 has 96 divisors (see below), whose sum is σ = 1465813440. Its totient is φ = 163710720.

The previous prime is 491163241. The next prime is 491163289. The reversal of 491163264 is 462361194.

491163264 is a `hidden beast` number, since 4 + 9 + 11 + 632 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23209 + ... + 38999.

It is an arithmetic number, because the mean of its divisors is an integer number (15268890).

Almost surely, 2^491163264 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 491163264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732906720).

491163264 is an abundant number, since it is smaller than the sum of its proper divisors (974650176).

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

491163264 is an equidigital number, since it uses as much as digits as its factorization.

491163264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15820 (or 15796 counting only the distinct ones).

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

The square root of 491163264 is about 22162.2035005547. The cubic root of 491163264 is about 788.9968916589.

The spelling of 491163264 in words is "four hundred ninety-one million, one hundred sixty-three thousand, two hundred sixty-four".