491639822720 has 256 divisors, whose sum is σ = 1242910310400. Its totient is φ = 185683968000.

The previous prime is 491639822693. The next prime is 491639822743. The reversal of 491639822720 is 27228936194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409358120 + ... + 409359320.

It is an arithmetic number, because the mean of its divisors is an integer number (4855118400).

Almost surely, 2^491639822720 is an apocalyptic number.

491639822720 is a gapful number since it is divisible by the number (40) 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 491639822720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (621455155200).

491639822720 is an abundant number, since it is smaller than the sum of its proper divisors (751270487680).

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

491639822720 is a wasteful number, since it uses less digits than its factorization.

491639822720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 491639822720 in words is "four hundred ninety-one billion, six hundred thirty-nine million, eight hundred twenty-two thousand, seven hundred twenty".