491636736 has 192 divisors, whose sum is σ = 1544961600. Its totient is φ = 153944064.

The previous prime is 491636729. The next prime is 491636737. The reversal of 491636736 is 637636194.

491636736 is a `hidden beast` number, since 4 + 9 + 1 + 636 + 7 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 491636691 and 491636700.

It is not an unprimeable number, because it can be changed into a prime (491636737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939771 + ... + 940293.

It is an arithmetic number, because the mean of its divisors is an integer number (8046675).

Almost surely, 2^491636736 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 491636736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772480800).

491636736 is an abundant number, since it is smaller than the sum of its proper divisors (1053324864).

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

491636736 is a wasteful number, since it uses less digits than its factorization.

491636736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 545 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 491636736 is about 22172.8828978101. The cubic root of 491636736 is about 789.2503362128.

The spelling of 491636736 in words is "four hundred ninety-one million, six hundred thirty-six thousand, seven hundred thirty-six".