491636256 has 24 divisors (see below), whose sum is σ = 1290545424. Its totient is φ = 163878720.

The previous prime is 491636231. The next prime is 491636261. The reversal of 491636256 is 652636194.

It is a tau number, because it is divible by the number of its divisors (24).

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 3 ways as a sum of consecutive naturals, for example, 2560510 + ... + 2560701.

It is an arithmetic number, because the mean of its divisors is an integer number (53772726).

Almost surely, 2^491636256 is an apocalyptic number.

It is an amenable number.

491636256 is an abundant number, since it is smaller than the sum of its proper divisors (798909168).

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

491636256 is a wasteful number, since it uses less digits than its factorization.

491636256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121224 (or 5121216 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 491636256 is about 22172.8720737752. The cubic root of 491636256 is about 789.2500793563.

The spelling of 491636256 in words is "four hundred ninety-one million, six hundred thirty-six thousand, two hundred fifty-six".