491144927064 has 384 divisors, whose sum is σ = 1446457098240. Its totient is φ = 138622176000.

The previous prime is 491144927023. The next prime is 491144927081. The reversal of 491144927064 is 460729441194.

It is a junction number, because it is equal to n+sod(n) for n = 491144926998 and 491144927016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 274842379 + ... + 274844165.

It is an arithmetic number, because the mean of its divisors is an integer number (3766815360).

Almost surely, 2^491144927064 is an apocalyptic number.

491144927064 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491144927064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723228549120).

491144927064 is an abundant number, since it is smaller than the sum of its proper divisors (955312171176).

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

491144927064 is a wasteful number, since it uses less digits than its factorization.

491144927064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963 (or 1948 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 491144927064 in words is "four hundred ninety-one billion, one hundred forty-four million, nine hundred twenty-seven thousand, sixty-four".