491747064 has 64 divisors (see below), whose sum is σ = 1255824000. Its totient is φ = 160414080.

The previous prime is 491747059. The next prime is 491747077. The reversal of 491747064 is 460747194.

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 15 ways as a sum of consecutive naturals, for example, 380259 + ... + 381549.

It is an arithmetic number, because the mean of its divisors is an integer number (19622250).

Almost surely, 2^491747064 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 491747064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627912000).

491747064 is an abundant number, since it is smaller than the sum of its proper divisors (764076936).

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

491747064 is a wasteful number, since it uses less digits than its factorization.

491747064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 491747064 is about 22175.3706620656. The cubic root of 491747064 is about 789.3093702461.

The spelling of 491747064 in words is "four hundred ninety-one million, seven hundred forty-seven thousand, sixty-four".